From the moment you wake up until you go to bed, you see millions of different images—different sizes, different colours. Why do we see what we do? And how sure are we that what we are seeing is actually true or is it affected by something else? It may be true that first impressions last, but remember, they aren’t always right! Includes: afterimages, lateral inhibition, the Hering Grid, the Munker illusion, blind spot, the Muller-Lyer illusions, the perspective explantion, eye movement theory, assimilation theory, anaglyphs, 3D images, and impossible figures.