I had come across the link earlier today and, re #7, it took until I started actually typing this for me to actually see the dolphins.
Check out this one:http://www.boingboing.net/2010/05/12/optical-illusion-imp.html
Very cool. I'm very tempted to go buy the magazine. Nice work, y'all--hope you get a kickback.
Definitely am buying an issue of this. And yes, my 4.5 year old only saw dolphins. However, he did not understand the evil cackling from my husband and me.
I cannot bear to show it to my 5.5 year old, in case she DOESN'T see dolphins! That would break my widdle heart.