I don't think I would equate running them through a sieve as the equivalent of unstirring, unless they had been put through the sieve to get "stirred" first. But--I can buy the bead idea. Cool, Zed! Yes--I think you could start with a bowl of beads that had a layer of small ones on the bottom and large ones on top, stir them a few times to where they were intermixed, then "unstir" as you said, until they were back the way they started. Theoretically, it ought to work, I think. Thanks!

Edit: Faldage, I take it back; I think I was being too narrow-minded, esp. re: a word that doesn't exist!