Recently, I bought a choppu set (miniature kitchen utensils) for a friend's daughter. Delightedly, she ran to her room to start playing. After a while, she came back to us, looking puzzled. "Amma, what's this?" she asked, holding up a kal-ural (grinding stone). "It's something you use to grind mavu for idli," my friend explained. "But how?" the little girl demanded.