This article is about Calvin's sandbox. For practicing edits, see Project:Calvin's Sandbox.
In summer, Calvin is seen playing outside in his sandbox. Typically, he will use the sandbox to build an elaborate miniature city only to destroy it in a disaster scenario. However, other purposes for which he has used it include playing out Spaceman Spiff adventures, hiding from Hobbes, or simply playing with his toy vehicles.

"It'll build character!"
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Calvin's Sandbox.

Calvin playing in his sandbox