I'm just back from this year's Vision Sciences Society meeting. Quite inspiring, and the “Best Illusion Contest” went better than expected. I have just added the first of the interesting ones to my collection on   #visualperception and   #opticalillusion . While the Ebbinghaus illusion is over 100 years old, the dynamic version (http://michaelbach.de/ot/cog-EbbingDyn/) markedly increases illusion strength. A deserved first winner, congratulations!