I think the photograph everyone is mentioning (at least I hope! This is the one that I remember!) shows a developing egg that has been cracked into a small, clear glass cup. The cup was then covered with a small piece of saran wrap, which was kept in place by a rubber band. I wondered too if that would work. They did it for some classroom experiment. My only question would be, how would you turn it? When you turn an egg, the insides turn with it. When you tilt a dish, the contents just slide. So my best guess is that it can be done, but it most likely wouldn't hatch a perfect baby. You'd also have to "pip" the saran wrap on Day 21.