A good illusion is a few different things all at once. Depending on how you look at it, you could say it’s a work of art, a puzzle, or a piece of graphic design (Or an old woman! Or a young woman! Or ...

Since the advent of cuneiform, we’ve designed written language to be a two-dimensional medium. Whether we’ve scribbled across a flat tablet or a piece of binder paper, we haven’t had to alter our ...