Illusions!
Closely related to E2: Perception of Stimuli, but immensely enjoyable on any occasion, illusions are your mind messing with you. Or are they? Here are some great collections.
The peer-iodic table of illusions, from NewScientist.com
Optical illusion collection from eChalk
MOIllusions – mighty optical illusions blog
Gravity-defying ramp wins illusion contest, from Nature
Illusion contest, from NeuralCorrelate
The ‘blue’ and ‘green’ are the same colour!
- Spiral Illusion from Bad Astronomy
In this article from NotExactlyRocketScience, Ed Yong explains that the size of your brain’s visual cortex (which is incredibly variable between people), affects how you see the world – including how likely you are to fall for optical illusions.
The Ebbinghuas illusion - which orange dot is larger? From NotExactlyRocketScience
……….o0O0o……….
Stare at the centre and then see what happens to the Moon!
Are these dots really moving? Find out at moillusions.
The next two are after-image illusions:
2008 Illusion of the Year by Lier and Vergeer @Neuralcorrelate. Stare at the dot and see what happens to the colour of the shapes when they turn white. Click on the image to go to the competition finalists website and then settle in for a few hours.
This one was tweeted by @StephenFry:
Enlarge, stare at the red dot for 30 seconds and then look up and blink at the ceiling. Whoo!
i-Biology 
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