Optical Illusions are super interesting - they exploit perceptual errors to trick you into seeing things that just aren't so.
Optical Lusions, on the other hand, show you exactly what you expect.
This series of ink-on-wood drawings reproduces a series of famous optical illusions
except
what you see is actually what you get.
Does that orange dot on the right look bigger than the one on the left? That's because it is.