Ten Great Ideas: Illusions

Wonderful website which has a great variety of illusions 4 Star
  Shop to purchase some of the items in the website above 4 Star
After-images Optical illusions page from the website above.  
Series of illusions From echalk.co.uk  
Ten cool illusions to start with From Richard Wiseman, courtesy of YouTube 5 Star
Illusions web-page From coolopticalilllusions.com 4 Star
The Selective Attention Test Don't believe your own eyes. YouTube. 1 min 4 Star
Why we need to be aware that we don't all see the same 'reality' Link YouTube. 1 min  
Two faces