Our fourth edition of "what is it?" was a real stumper; no one correctly guessed what it was. No one was close. The answer: it's the anti-ant mechanism for our ant cabinet. Ants are everywhere in Thailand, and they've already invaded our house. If you don't have some way of keeping them out of your food, they'll eat your out of house and home. Thus we have an ant cabinet. The blue gizmos at the bottom function as moat of sorts, a moat filled with baby powder. Someone figured out that ants can't or won't cross baby powder, thus keeping them out of the food.
Hmm, that's different.