What’s that, Jack? embodies curiousness and stays fresh with repeated read-alouds. The catchphrase is very fun to use on repeat—I don’t know, George, I don’t know!

Rachel Lawson, Publisher

What’s That, Jack?


Two curious animals have a remarkable adventure with a strange object that changes with the landscape then flies back into the sky—they don’t know what it was, but what a day they had!

Jack and George are resting quietly when BOOM! A huge and strange ball lands beside them. “What’s that, Jack?” “I don’t know, George. Maybe it’s a rock?” No—too soft. But it rolls. Fast! Jack, George and the ball roll right off the cliff and now it’s a parachute. But watch out, they’re going to land in the river…

Jack and George have a brilliant day full of adventure with this object that changes with the landscape. But what is it? It doesn’t matter, it was fun trying to figure it out.

This bright and funny book is a game of twists and turns, with a joyful refrain and vivid artwork to capture every toddler’s imagination.

Look inside videoActivity sheet


  • Book Details

    Country of Origin France
    Reader Age 2-5 year
    Book Size

  • Reviews

    1. Kids Read the World

      I love this kind of picture book that has spare text, but big ideas.

    2. Reading Time – Children’s Book Council of Australia

      The artwork is in block colours and vivid in style. The language is simple and child friendly and engages in an imaginative romp.

    3. Youth Services Book Review

      Kids will enjoy the simple, repetitive text, and the mystery of the blue thing and what it will become next. Adults can talk about how the friends may be using their imagination, and how we do that when we play.

    4. Kirkus Reviews

      Will inspire youngsters to embrace uncertainty—and adventures.

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