One More BookFind a book
Cover of Square
Picture · ages 3–7

Square

Written by Mac Barnett · Illustrated by Jon Klassen

Book 2 of 3 in The Shape TrilogyView the full series

Part of the Mac Barnett universeOpen the collection

Major award winner
Top giftableAdults love it tooEndlessly rereadable

Square pushes a cube up a hill all day, it crumbles apart and makes something beautiful, and Circle declares him a genius. Mac Barnett and Jon Klassen's quietly profound book about effort, art, and the gap between intention and outcome.

  • Best for3–7
  • FormatPicture
  • Length56 pp
  • Read aloud~11 min
Save to a listFind similar books

The vibe

What it’s like.

Style

  • Repetitive
  • Conversational

Tone

  • Funny
  • Warm
  • Whimsical
  • Thought provoking

Themes

On the pageshapes, square, art, cube, genius

Experience meters

Energy2/ 5
Humour4/ 5
Scariness1/ 5
Peril1/ 5
Wonder4/ 5
Cosiness3/ 5
Emotional intensity2/ 5
Conceptual intensity4/ 5

What’s it about?

The story.

Square pushes a heavy cube up a hill to his cave. He does this every day. When the cube crumbles and breaks apart, it leaves something, something that Circle, passing by, immediately recognises as art. She is amazed. She is moved. She tells everyone Square is a genius. Square does not know what she is talking about. Mac Barnett's text is even more minimal here than in Triangle: Square says almost nothing, and the gap between what Circle sees and what Square understands is where the comedy and the philosophy both live. For children, it is simply funny that Circle is so excited about something Square cannot see. For adults, it resonates as a meditation on how art gets made, by accident, through labour, in ways the maker doesn't always intend or understand. Jon Klassen's illustrations make the crumbling cube genuinely beautiful; the colours shift across the page as the light changes. The warmest and most inward-looking of the three books, and the most rewarding for parents and carers who want a picture book that gives them something to think about too.

Fit check

Right for your child?

Where it lands by age

  • 1
  • 3
  • 5
  • 7
  • 9
  • 11
  • 13
  • Best fit · 3–7
  • Read aloud · 3–10
  • Independent · 5–7

Prose load

Minimal

Visual support

Very high

Reluctant-reader friendly

Very

Read-aloud quality

Excellent

Works well for

  • Reading aloud
  • Bedtime
  • Reading together
  • Gift-buying
  • Reluctant readers
Low sensitivityNo content warnings

Nothing in the book is likely to concern most parents. Safe to recommend without preview.

Bedtime suitability

4 / 5 · Bedtime-friendly

Sensitive-child

4 / 5 · Good fit

Graphic intensity

1 / 5 · None

Best for

  • Picture book adults love
  • Art themed
  • Gift book
  • Read aloud
  • Caldecott honor

Avoid if

No common reasons to avoid this one — a rare clean sweep on the sensitivity flags.

In the classroom

How it works in school.

Barnett and Klassen's deadpan shape trilogy — funny read-alouds rich for inference and talk about friendship, trust and mischief.

Classroom role

  • Read aloud
  • Discussion and empathy
  • Writing inspiration

Good for teaching

  • Inference
  • Character motivation

A book children love that happens to support school — never a stand-in for the texts a class is taught with. Reviewed for the classroom · June 2026.

Why it lands

Why they love it.

Why kids love it

The specific delight is Circle thinking Square is a genius — Square just pushing one block out of his cave, the block crumbling into accidental art, Circle convinced he's a sculptor and demanding her own portrait. The Shape Trilogy at its most quietly philosophical.

  • Being special or chosen
  • Making a difference

Why parents love it

The middle Shape Trilogy book — Mac Barnett and Jon Klassen at their quietest, the gap between Square's bafflement and Circle's certainty doing all the work. What makes someone an artist? The question landing as comedy. Best read after Triangle.

  • Great writing
  • Quick to read
  • Beautiful illustrations
  • Conversation starter

In the series

The Shape Trilogy.

3 books · open the series →

About the creators

About the creators.

MB

Mac Barnett

Writer · United States · b. 1982

Mac Barnett is an American children's author born in 1982, known for picture books and illustrated chapter books with an absurdist, meta-storytelling sensibility. He collaborates frequently with illustrators including Jon Klassen (Sam and Dave Dig a Hole, Extra Yarn, The Wolf, the Duck and the Mouse, the Shape Trilogy), Mike Lowery (Mac B., Kid Spy chapter books), and Shawn Harris (The First Cat in Space). His work has won two Caldecott Honors and a Boston Globe-Horn Book Award. Barnett's voice is distinctively dry, knowing and quietly subversive, adults reading aloud often enjoy his books as much as the children listening. A reliable hit for families looking for funny-bone reads with intelligent edges.

More from Mac Barnett
JK

Jon Klassen

Illustrator · Canada · b. 1981

Jon Klassen is a Canadian author-illustrator born in 1981 in Niagara Falls, Ontario, whose flat, deadpan, almost cinematic picture books have become one of the most distinctive visual signatures in contemporary children's publishing. He won the Caldecott Medal for This Is Not My Hat (2013), making him the first illustrator to win both the Caldecott and the Greenaway, after a Caldecott Honor for I Want My Hat Back. His Hat Trilogy (I Want My Hat Back, This Is Not My Hat, We Found a Hat) is darkly funny in a Coen-brothers register that adults love almost as much as the children listening. He also frequently collaborates with Mac Barnett (Sam and Dave Dig a Hole, the Shape Trilogy, Extra Yarn) and recently released The Rock from the Sky and The Skull.

More from Jon Klassen

If you liked this

Three ways out of this book.

If you liked this, try…

Lateral matches. Same shelf, different texture.

Come into this from…

Easier or preparing reads — perfect lead-ins.

Where to go next…

Escalation reads — a step up in scale, silliness, or stakes.

Buy or borrow

Pick up a copy.

  • Bookshop.org
  • Waterstones
  • Amazon UK
  • Hive
Find it at your local library →

When you buy through the links above, we may earn a small commission — it never costs you more, and it never changes the books we choose. How we’re funded →

Last reviewed · April 2026Suggest a correctionHow we recommend

More ways to wander the room