Gallery 4

Is the door opening towards you?

Or is it away from you?

Which way are this book's pages going?

Are they fanned towards you or away?

In this last example, the square(s) in #s 1 and 3 and the triangle in #2 are not really there.

They are implied by the missing pieces of the colored shapes.

Are they random pie charts?

Or is there an invisible cube hiding here?

This is the impossible crate.

It's similar to the Impossible triangle in Gallery 1.

See if you can figure this one out.