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FUN STUFF

The disappearing glasses

Position your head an arm's length away from the screen
Cover your left eye with your hand and stare directly at the centre of the cross with your right eye
Slowly move your head towards the screen, continuing to stare at the cross
Are the glasses still there?

The glasses disappear completely because they are now positioned within the blind spot of your right eye. The beginning of the optic nerve in the retina can't respond to light stimulation, and therefore is called our 'blind spot'. The Scintillating Grid

Move your eyes around the grid and you'll see the dots appear to blink.

Our eyes automatically sharpen contrasts on surface edges to make it easier to separate objects from their backgrounds; the grid's design forces the eye to try and see surface edges that aren't there. Spin me right round

Known as the 'Revolving Circles', the circle appears to be moving slowly

This illusion occurs whenever certain types of flat static patterns are moved across our peripheral visual field. Line them up

Which line is longer - the pink or the yellow?

This is a variation of the famous Muller-Lyer Illusion. The two lines are actually exactly the same length... but our visual system detects depth cues usually associated with 3D scenes, and incorrectly decides it is a 3D drawing, making the pink line appear longer.