What is not three-dimensional ?

Question

I think I already have the answer, but I'm just trying to make sure that I have the correct understanding.

Words in books are not three-dimensional, right ?

Yeah ... I guess it's common sense, but not when you've never thought of something like this ~lol

Answer 1

All reproduced images on screen, even those in "3D", are two dimensional images. Light doesn't have depth so those images are truly two dimensional.

Answer 2

Nothing physical in our world has only two dimensions.  Even the words in books have some microscopic depth to them.

We use references to two-dimensional things all the time though, like a plane, an image, a triangle, etc.

Answer 3

Rainbow.

Answer 4

A shadow?

Answer 5

shadows