Potholder Patterns

Welcome!

This website was created by Piglet Evans and Matthew Simon Cavalletto to share our collection of charts that explore techniques for weaving potholders from loops. Read more about this collection.

The collection is available both as a single large PDF file and as individual charts that can be downloaded as image files from the list below. Items marked as “New!” have been added recently and are not yet included in the PDF.

There’s also an accompanying series of blog posts that include photos and commentary on many of the designs, as well as more general discussions of weaving techniques and pattern design.

How to Read Our Charts

Understanding a few common conventions used by the potholder-weaving community will help you understand how to read our charts.

These Charts are Free

This collection, and each of the individual charts, are available to everyone for free under an “open culture” license.

Combined PDF

All Charts as Single PDF File December 2022 Edition

Plain Weave §

Basic Tabby: 27-Peg Chart, 18-Peg Chart

Threading with groups (AAABBB):

Nine Block: 27-Peg Chart, 18-Peg Chart

Plaid (Stripes of 6): 27-Peg Chart

Plaid (Stripes of 5): 27-Peg Chart, 18-Peg Chart

Plaid (Stripes of 4): 27-Peg Chart, 18-Peg Chart

Plaid (Stripes of 3): 27-Peg Chart, 18-Peg Chart

Pinwheels: 27-Peg Chart, 18-Peg Chart, Blog Post

Threading solid & alternating (AAAA x ABAB):

Dot Grid: 27-Peg Chart, 18-Peg Chart

Split Dot Grid: 27-Peg Chart, 18-Peg Chart

Scattered Dots: 27-Peg Chart, 18-Peg Chart

Threaded solid & alternating (AAAA x AABB):

Seersucker: 27-Peg Chart, Facebook

Split Seersucker: 27-Peg Chart

Threading with alternating colors (ABABAB):

Stripes: 27-Peg Chart, 18-Peg Chart

Alternating with occasional repeats (ABABAABABA):

Half Stripes: 18-Peg Chart

Broken Stripes: 27-Peg Chart, 18-Peg Chart

Log Cabin (Blocks of 9): 27-Peg Chart, 18-Peg Chart

Log Cabin (Blocks of 7): 27-Peg Chart, 18-Peg Chart

Log Cabin (Blocks of 5): 27-Peg Chart, 18-Peg Chart

Bars: 27-Peg Chart, 18-Peg Chart

Alternating with repeats one way and inverted the other (ABABAABABA x BABABBABAB):

Barbells: 27-Peg Chart, 18-Peg Chart

Double Barbells: 27-Peg Chart

Threading with alternating colors one way and uneven groups the other (ABABAB x AABAAB):

Narrow Ladders: 27-Peg Chart, 19-Peg Chart

Contrasting Narrow Ladders: 27-Peg Chart

Ladders: 27-Peg Chart, 19-Peg Chart

Contrasting Ladders: 27-Peg Chart

Double Ladders: 27-Peg Chart

Assorted Ladders: 27-Peg Chart

Wide Ladders: 27-Peg Chart, 19-Peg Chart

Broken Ladders: 27-Peg Chart

Combs: 27-Peg Chart

Broken Combs: 27-Peg Chart

Threaded in Cycles (AAABAB):

Morse Code: 27-Peg Chart, 19-Peg Chart

Narrow Stripes (AABBAAAA):

Border: 27-Peg Chart, 18-Peg Chart New!

Stripe Border: 27-Peg Chart, 18-Peg Chart

Puzzle Pieces: 27-Peg Chart

Three Color Threading:

Tri-Color Nine Block: 27-Peg Chart, 18-Peg Chart New!

Gingham: 27-Peg Chart, 18-Peg Chart

Tri-Color Herringbone: 27-Peg Chart, 18-Peg Chart

Tri-Color Pinwheels: 18-Peg Chart

Double-Stripe Border: 27-Peg Chart, 18-Peg Chart

Thin Double-Stripe Border: 27-Peg Chart New!

Double-Stripe Grid: 28-Peg Chart New!

Basketweave §

Two-Two Basketweave: 27-Peg Chart, 18-Peg Chart, Blog Post

Basketweave Steps: 28-Peg Chart, 18-Peg Chart

Basketweave Stripes: 27-Peg Chart, 18-Peg Chart

Basketweave Log Cabin: 28-Peg Chart

Three-Three Basketweave: 27-Peg Chart, 18-Peg Chart

Half Basketweave:

Half Basketweave: 27-Peg Chart

Half Basketweave Stripes: 27-Peg Chart, 18-Peg Chart, Facebook

Two-One Basketweave: 27-Peg Chart, 18-Peg Chart

Two-One Basketweave Grid: 18-Peg Chart New!

Two-One Basketweave Bands: 19-Peg Chart New!

Partial Basketweave:

Fragile Ladders: 27-Peg Chart New!

Chunky Ladders: 27-Peg Chart New!

Shadow Weave

Interrupted Stripes: 27-Peg Chart, 19-Peg Chart New!

Corners allow stripes to change direction:

Corners: 27-Peg Chart, 18-Peg Chart, Blog Post

Ziggity-Do-Dah: 27-Peg Chart, 18-Peg Chart, Blog Post

Twisted Corners: 27-Peg Chart

Parallel Corners: 27-Peg Chart, 18-Peg Chart, Facebook

Four Corners: 27-Peg Chart

Diverging Corners: 27-Peg Chart, 19-Peg Chart, 18-Peg Chart

Intersecting Corners: 27-Peg Chart, 18-Peg Chart, Blog Post

Tiny Intersecting Corners: 27-Peg Chart, 18-Peg Chart

Boxes are formed by four corners:

Noughts and Crosses: 27-Peg Chart, 18-Peg Chart, 17-Peg Chart

Square Tiles: 27-Peg Chart

Small Square Tiles: 27-Peg Chart

Tiny Square Tiles: 27-Peg Chart

Radiating Boxes: 27-Peg Chart, 19-Peg Chart, 18-Peg Chart, Blog Post

Temple of Kukulcán: 27-Peg Chart New!

Nesting Boxes: 27-Peg Chart, Blog Post

Stacked Blocks: 27-Peg Chart, 19-Peg Chart New!

Offset Stacked Blocks: 27-Peg Chart, 19-Peg Chart New!

Square Spirals:

Square Spiral: 27-Peg Chart, 18-Peg Chart, Blog Post

Square Spiral Bands: 27-Peg Chart

Small Square Spiral Bands: 27-Peg Chart, 18-Peg Chart New!

Tiny Square Spiral Bands: 27-Peg Chart, 18-Peg Chart New!

Square Double Spiral: 27-Peg Chart, 18-Peg Chart, Facebook

Paths:

Two Corners: 27-Peg Chart

Floating Diamond: 27-Peg Chart, 18- or 17-Peg Chart, Blog Post

Floating Circle: 27-Peg Chart, 19-Peg Chart, Facebook New!

Open Square: 27-Peg Chart

Right Hook: 27-Peg Chart

Branches are like corners connected by a stalk:

Branch: 27-Peg Chart, 18-Peg Chart, Blog Post

Parallel Branches (Arms of 6): 27-Peg Chart, 18-Peg Chart, Blog Post

Parallel Branches (Arms of 4): 27-Peg Chart, 18-Peg Chart, Blog Post

Parallel Branches (Arms of 2): 27-Peg Chart, 18-Peg Chart

Paired Branches (Arms of 4): 27-Peg Chart, Facebook

Paired Branches (Arms of 2): 27-Peg Chart

Fourfold Branches (Arms of 4): 27-Peg Chart, Facebook

Fourfold Branches (Arms of 2): 27-Peg Chart

Forked Branch: 27-Peg Chart, Blog Post

Branch and Root: 27-Peg Chart, Blog Post

Worms:

Worms: 27-Peg Chart

Wiggle Worms: 27-Peg Chart

Snakes: 27-Peg Chart

Inchworms: 27-Peg Chart

Paths:

Bridges and Tunnels: 27-Peg Chart

Greek Key: 27-Peg Chart, 19-Peg Chart, Blog Post

Greek Half-Key: 27-Peg Chart, 19-Peg Chart

Criss-Cross: 27-Peg Chart, 19-Peg Chart, Facebook

Offset Pistons: 27-Peg Chart

Twisty Little Passages: 27-Peg Chart, Blog Post

Twisty Tiny Passages: 27-Peg Chart New!

Haring To Go: 27-Peg Chart, Blog Post

Chartres Labyrinth: 27-Peg Chart, Blog Post, Blog Post

Chartres Labyrinth Revisited: 27-Peg Chart, Blog Post

The Long Road Home: 27-Peg Chart

Tiles:

Twinkle Twinkle: 27-Peg Chart, Blog Post

Little Stars: 27-Peg Chart

Blocks and Crosses: 27-Peg Chart, 19-Peg Chart, Facebook, Facebook

Roses and Thorns: 27-Peg Chart, Blog Post

Breeze Block: 27-Peg Chart, 19-Peg Chart

Crosses:

Sea of Naughts and Crosses: 27-Peg Chart

Crazy Crosses: 27-Peg Chart

Super Crosses: 27-Peg Chart

Pulsating Saltire (Arms of 2): 27-Peg Chart

Pulsating Saltire (Arms of 4): 27-Peg Chart

Pulsating Saltire (Arms of 6): 27-Peg Chart

Pulsating Millrind: 27-Peg Chart

Eights:

Crazy Eights: 27-Peg Chart, 19-Peg Chart Blog Post

Super Eights: 27-Peg Chart, Blog Post

Chevrons:

Fish Scales: 27-Peg Chart, 18-Peg Chart, Blog Post

Three-Color Fish Scales: 27-Peg Chart, 18-Peg Chart, Facebook

It’s Raining Hearts: 27-Peg Chart, 18-Peg Chart, 9-Peg Chart, Blog Post

Super Hearts: 27-Peg Chart

Pulsating Heart: 27-Peg Chart, 18-Peg Chart

Bands:

Parallel Bands: 27-Peg Chart, 18-Peg Chart

Nested Bands: 27-Peg Chart, 19-Peg Chart

Fifties Banded Flair: 27-Peg Chart, 18-Peg Chart, Facebook

Pierced Lattice: 27-Peg Chart, 19-Peg Chart, Blog Post

Tri-Color Pierced Lattice: 27-Peg Chart, 19-Peg Chart

Interlocking Teeth:

Linear Zippers: 27-Peg Chart

Offset Zippers: 27-Peg Chart

Angled Zippers: 27-Peg Chart

Angled Half-Zippers: 27-Peg Chart

Waves: 27-Peg Chart

Interlocking Shapes:

Mesa Verde: 27-Peg Chart

Crystal Forest: 27-Peg Chart

Sun Point: 27-Peg Chart

Figures:

Sheila’s Shamrock: 27-Peg Chart, Blog Post

Lettering:

Pot Hol Der: 27-Peg Chart, Facebook

Two-Two Twill §

Basic Two-Two Twill: 27-Peg Chart, 18-Peg Chart

Threaded solid & alternating (AAAA x ABAB):

Twill Dash Grid: 27-Peg Chart

Twill Split Dash Grid: 27-Peg Chart

Twill Dash and Zed Lanes: 27-Peg Chart

Two-two twill with alternate threading colors:

Two-Two Twill Steps: 27-Peg Chart, 18-Peg Chart, Facebook

Two-Two Twill Zeds: 27-Peg Chart

Twill Nine Block: 27-Peg Chart, 18-Peg Chart, Facebook

Houndstooth Twill: 27-Peg Chart, 18-Peg Chart, Blog Post

Sharktooth Twill: 27-Peg Chart, Blog Post

Tri-Color Houndstooth Twill: 27-Peg Chart, Facebook

Tri-Color Twill Splotches: 27-Peg Chart, Blog Post

Broken Twill Splotches: 27-Peg Chart, Blog Post

Two-two twill with changes of direction:

Two-Two Twill Chevrons: 27-Peg Chart, 18-Peg Chart

Jumbo Zig Zag Twill: 27-Peg Chart

Hallstatt 74: 27-Peg Chart, Blog Post

Zig Zag Twill: 27-Peg Chart, 18-Peg Chart, Blog Post

Back and Forth Twill: 27-Peg Chart, 18-Peg Chart, Facebook

Two-Two Twill Saltire: 27-Peg Chart

Two-Two Twill Diamonds: 27-Peg Chart, 18-Peg Chart

Twill Pavé: 27-Peg Chart

Twill Diamond Waves: 27-Peg Chart, 19-Peg Chart New!

Spots and Waves: 27-Peg Chart, 19-Peg Chart New!

Wall of Troy: 27-Peg Chart New!

Wall of Troyish: 27-Peg Chart

Two-two twill with breaks:

Broken Twill: 27-Peg Chart, Blog Post

Herringbone Twill: 27-Peg Chart, Blog Post

Short Herringbone Twill: 27-Peg Chart

Asymmetric Herringbone: 28-Peg Chart, 18-Peg Chart New!

Leaning Tower Twill: 27-Peg Chart, 18-Peg Chart, Blog Post

Kreuzköper: 27-Peg Chart, 18-Peg Chart New!

Two-two twill with complex patterns:

Twill Chevronels: 27-Peg Chart

Twill Mesh: 27-Peg Chart, Blog Post

Two-two twill steps with changes of direction:

Cross Breeze: 27-Peg Chart, 18-Peg Chart, Blog Post

Rick Rack: 27-Peg Chart, 18-Peg Chart, Blog Post

Garden Path: 27-Peg Chart, Blog Post

Twill Step Diamond: 27-Peg Chart, 19-Peg Chart, Facebook

Chladni Wave Plate: 27-Peg Chart, 19-Peg Chart, Blog Post

Diamond Spiral: 27-Peg Chart, 18-Peg Chart, Blog Post

Three-Three Twill

Three-Three twills:

Three-Three Twill: 27-Peg Chart, 18-Peg Chart, Blog Post

Three-Three Twill Steps: 27-Peg Chart, 18-Peg Chart New!

Three-Three Twill Fletching: 27-Peg Chart, 18-Peg Chart New!

Three-Three Houndstooth: 27-Peg Chart, 18-Peg Chart New!

Three Color Threading

Tri-Color Twill Steps: 27-Peg Chart, 18-Peg Chart New!

Tri-Color Twill Herringbone: 27-Peg Chart, 18-Peg Chart New!

Four-Four Twill

Four-Four Twill: 27-Peg Chart, 18-Peg Chart, Facebook New!

Four-Four Twill Steps: 27-Peg Chart, 18-Peg Chart New!

Four-Four Twill Big Steps: 27-Peg Chart New!

Four-Four Twill Fletching: 27-Peg Chart, 18-Peg Chart, Facebook New!

Baskerville Houndstooth: 27-Peg Chart, 18-Peg Chart New!

Half-Basketweave Twill: 28-Peg Chart, 18-Peg Chart New!

Five-Five Twill

Five-Five Twill: 27-Peg Chart, 18-Peg Chart New!

Two-One Twill

Two-One Twill: 27-Peg Chart, 18-Peg Chart

Two-One Chevron Twill: 19-Peg Chart, Facebook New!

Alternating ribbons:

Rippenköper: 27-Peg Chart, 19-Peg Chart

Five-Row Rippenköper: 27-Peg Chart, Facebook

Broken Rippenköper: 27-Peg Chart

Angled Rippenköper: 27-Peg Chart, 18-Peg Chart

Rippenköper Chevrons: 27-Peg Chart

Rippenköper Broken Saltire: 27-Peg Chart

Alternating on each side (ABAB, AABB):

Two-One Twill Steps: 27-Peg Chart, 18-Peg Chart

Dogbone Two-One Twill: 27-Peg Chart

Two-One Twill Tilted Steps: 18-Peg Chart New!

Alternating blocks:

Two-One Twill Nine Block: 27-Peg Chart, 18-Peg Chart, Facebook

Two-One Twill Stacks: 27-Peg Chart, Blog Post

Alternating in groups of three on each side (ABAABA, ABCABC):

Two-One Twill Pinstripes: 27-Peg Chart, 18-Peg Chart

Pinstripe Log Cabin: 27-Peg Chart

Pinstripe Noughts and Crosses: 27-Peg Chart, 18-Peg Chart, Blog Post

Tri-Color Two-One Stripes: 27-Peg Chart, 18-Peg Chart

Tri-Color Log Cabin: 27-Peg Chart

Tri-Color Log Cabin (of 13): 27-Peg Chart

Tri-Color Two-One Corners: 27-Peg Chart, 18-Peg Chart

Tri-Color Two-One Zig-Zag: 27-Peg Chart

Tri-Color Noughts and Crosses: 27-Peg Chart

Tri-Color Square Spiral: 27-Peg Chart, 18-Peg Chart, Facebook

Three-One Twill

Three-One Twill: 27-Peg Chart

Three-One Herringbone: 27-Peg Chart, 19-Peg Chart, Facebook

Three-One Twill Stripes: 27-Peg Chart New!

Three-One Twill Steps: 27-Peg Chart New!

Multicolor:

Quad-Color Twill Stripes: 27-Peg Chart, 18-Peg Chart New!

Alternating bands:

Egyptian Rippenköper: 27-Peg Chart, 18-Peg Chart

Anchor Chains: 27-Peg Chart, 19-Peg Chart, 18-Peg Chart, Facebook, Facebook, Facebook New!

Three-Two Twill

Three-Two Twill: 27-Peg Chart

Satin §

Three-One Satin: 27-Peg Chart, 18-Peg Chart, Blog Post

Four-One Satin: 27-Peg Chart, 18-Peg Chart, Facebook

Five-One Satin: 27-Peg Chart

Mixed Twills

Traveling Twill: 27-Peg Chart, 18-Peg Chart, Blog Post

Three-Two-One-Two Twill: 27-Peg Chart, 18-Peg Chart, Facebook

Three-Three-One-One Twill: 27-Peg Chart, 18-Peg Chart

Twill-Tabby Angled Bands: 27-Peg Chart, 18-Peg Chart

Angled Twill Fade: 28/27-Peg Chart, 19/18-Peg Chart, Facebook, Facebook New!

Tri-Color Chevrons: 27-Peg Chart, 18-Peg Chart, Facebook

Twill-like Patterns

Beaded Twill: 27-Peg Chart, 18-Peg Chart

Barleycorn: 27-Peg Chart, 19-Peg Chart New!

Twilled Hopsack: 26-Peg Chart, 18-Peg Chart New!

Separated Twill Crosses: 27-Peg Chart, 19-Peg Chart, Blog Post

Diamond Tiles: 27-Peg Chart, Blog Post

Open Diamond Tiles: 27-Peg Chart

Multilayer Twill

Double-Layer Three-Three:

Three-Three Shift Twill: 27-Peg Chart, 18-Peg Chart, Blog Post

Magical Three-Three Twill: 27-Peg Chart, 18-Peg Chart, Blog Post

Magical Newsprint: 27-Peg Chart, 18-Peg Chart, Blog Post, Facebook, Facebook

Three-Three Twill Waves: 27-Peg Chart

Weft-Faced Three-Three:

Three-Three Offset Twill: 27-Peg Chart, 18-Peg Chart, Blog Post, Blog Post

Three-Three Offset Bands: 27-Peg Chart, Blog Post

Double-Layer Four-Four:

Four-Four Shift Twill: 27-Peg Chart, 18-Peg Chart New!

Double-Faced Three-One:

Double-Faced Twill: 18-Peg Chart New!

Figurative Patterns

Tabby-based:

Pinwheels (of 4): 27-Peg Chart, 18-Peg Chart

Pinwheels (of 6): 27-Peg Chart18-Peg Chart

Pinwheels (of 8): 27-Peg Chart New!

Tri-Color Windmills: 27-Peg Chart

Off-Kilter: 27-Peg Chart, 18-Peg Chart, Blog Post

Multi-Color Off-Kilter: 27-Peg Chart, 18-Peg Chart

Diamond Buffalo: 27-Peg Chart, 19-Peg Chart, Facebook, Facebook

Triangle Blocks: 27-Peg Chart, 18-Peg Chart, Facebook

Twill-based:

Two-Two Twill Starfield: 27-Peg Chart

Three-Three Twill Starfield: 27-Peg Chart

Bricks In The Wall: 27-Peg Chart

Scandinavian Poinsettia: 27-Peg Chart New!

Solitary Snowflake: 27-Peg Chart New!

Float-Faced Blocks

Alladorf 60: 27-Peg Chart, 19-Peg Chart New!

Split-Loops §

Split-Loop Tabby: 27-Peg Chart, 18-Peg Chart

Twill:

Split-Loop Twill: 27-Peg Chart, 18-Peg Chart, Blog Post

Split-Loop Twill Cables: 27-Peg Chart

Split-Loop Wide Chevrons: 27-Peg Chart

Split-Loop Narrow Chevrons: 27-Peg Chart

Split-Loop Wide Zig-Zags: 27-Peg Chart

Split-Loop Narrow Zig-Zags: 27-Peg Chart

Bands:

Split-Loop Chains: 27-Peg Chart, 18-Peg Chart, Blog Post

Split-loop Basketweave:

Half-Offset Basketweave: 27/26-Peg Chart, 19/18-Peg Chart New!

Mixed Weaves

Plain Weave and Basketweave:

Tabby-Framed Basketweave: 27-Peg Chart, Facebook New!

Basketweave-Framed Tabby: 27-Peg Chart, Facebook New!

Tabby-Banded Half-Basketweave: 28-Peg Chart, 18-Peg Chart New

Twill and Basketweave:

Basket-Banded Twill: 18/17-Peg Chart, Facebook New!

Basket-Banded Twill Chevrons: 18/17-Peg Chart New

Basketweave Broken Steps: 27-Peg Chart

Basketweave Uneven Steps: 27-Peg Chart

Plain Weave and Twill:

Tabby-Framed Twill Steps: 27-Peg Chart, 19-Peg Chart New!

Twill-Framed Tabby Boxes: 27-Peg Chart, 19-Peg Chart New!

Tabby-Framed Twill Bends: 27-Peg Chart New!

Twill-Framed Tabby Checks: 27-Peg Chart New!

Tabby-to-Twill Bends: 27-Peg Chart, 18-Peg Chart, Facebook New!

Twill-to-Tabby Bends: 27-Peg Chart, 18-Peg Chart, Facebook New!

Twill-to-Tabby Diamonds: 19-Peg Chart New!

Overshot §

Alternating Float Weave: 27-Peg Chart, 19-Peg Chart, Facebook New!

Tri-color Alternating Floats: 27-Peg Chart, 19-Peg Chart New!

Faux Corduroy: 27-Peg Chart, 19-Peg Chart

Tri-Color Corduroy: 27-Peg Chart, 19-Peg Chart, Facebook

Summer/Winter: 27-Peg Chart

Summer/Winter Nine Block: 27-Peg Chart

Halvdräll Nine Block: 27-Peg Chart, Blog Post

Padded Basetweave

Padded Basketweave: 27-Peg Chart, 18-Peg Chart, Blog Post

Padded Basketweave Steps: 27-Peg Chart, 18-Peg Chart, Blog Post

Textured Boxes §

Tiny Boxes: 27-Peg Chart, 19-Peg Chart, Blog Post

Tumbling Boxes: 27-Peg Chart, 18-Peg Chart, Blog Post

Double Boxes: 27-Peg Chart, 19-Peg Chart

Moving Boxes: 27-Peg Chart, 18-Peg Chart, Facebook

Tri-Color Moving Boxes: 18-Peg Chart

Giant Boxes: 27-Peg Chart, 19-Peg Chart

Indented Bendlets: 27-Peg Chart, 19-Peg Chart, Blog Post, Facebook, Facebook

Tumbling Boxes: 27-Peg Chart, 18-Peg Chart

Wonder Waffle: 27-Peg Chart, 19-Peg Chart, Blog Post

Cobblestone: 27-Peg Chart, 19-Peg Chart, Blog Post

Waffle Weave §

Micro Waffle: 27-Peg Chart, 19-Peg Chart

Mini Waffle: 27-Peg Chart, 19-Peg Chart

Liége Waffle: 27-Peg Chart, 19-Peg Chart, Facebook

Breakfast Waffle: 27-Peg Chart, 19-Peg Chart, Facebook

Belgian Waffle: 27-Peg Chart, 19-Peg Chart, Facebook

Offset Waffle: 18-Peg Chart New!

Jumbo Waffle: 27-Peg Chart, 19-Peg Chart

Brighton Honeycomb

Brighton Honeycomb: 28-Peg Chart, 18-Peg Chart New!

Jumbo Brighton Honeycomb: 28-Peg Chart, 18-Peg Chart New!

Other

Sluier van Maria: 27-Peg Chart, 19-Peg Chart New!

Gauze §

Gauze: 18-Peg Chart, Facebook

Blank Charts

All Blank Charts as Single PDF File

Blank: 27-Peg Chart, 18-Peg Chart, 9-Peg Chart, 27×18-Peg Chart

Blank Split-Loop: 27-Peg Chart, 18-Peg Chart

Blank Tabby: 27-Peg Chart, 18-Peg Chart