Here are a few clever projects/designs made from plywood, here’s a ladder Link.

A computer desk and chair, all from one sheet – Link.

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A puzzle chair (also from one sheet) – Link.

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A really fun DIY chair (no glue or fasteners needed, the hammer is a soup can) – Link.

And last up, a little morbid – these flat coffins that also assemble quickly and without fasteners glue – Link.