What I did on my summer vacation

the visual cliff experiment,

Sadly, it's only two minutes long and so doesn't show rats and chickens and goats being tested on the visual cliff like the complete version does, but at least you can get an idea what the apparatus looks like. If you really want to know how more about Eleanor Gibson or the visual cliff here's a fairly informative obituary and an online reprint of the original 1960 Scientific American article which first publicized the results of the study. Oh, and you can also look at some funny pictures of pigs and babies and goats on the cliff which were taken for an article in Life Magazine (click on any of the 'Related Images' to see the other pictures).