visual attention

While looking up a bunch of references on visual attention, I stumbled across this collection of stimuli for visual attention experiments on change blindness and inattentional blindness. Fun fun fun.

This video in particular got me. The first time I watched it, purposefully trying to NOT overtly look for changes, I didn't notice anything unusual. On second view, however, I saw at least 5. I still have to figure out the other 4...