On my website on #visualperception , visual phenomena and #opticalillusion  the “motion-induced blindness” demo has been particularly popular. Apparently it's used for schooling of drivers, to drive home the message how easy it is to overlook something.

  Converting this from Flash to JavaScript, I added a new twist, namely the ring (as seen as the yellow stippled circle below) and more. You can try it out yourself here: http://michaelbach.de/ot/mot-mib/