An anonymous reader writes: Societal norms and my sibling's procreative endeavors have put me in the position of having to buy gifts twice a year for young children. What makes them happy are unremarkable bits of plastic. They already have innumerable unremarkable bits of plastic (from their parents and grandparents). My preference would be to get them gifts that challenge them to think creatively (or at least to think), which they'll be able to pick up and enjoy even after they outgrow their train/truck/homemaking fetishes. Beyond the Rubick's Cube, what thinky toys from your childhood are still in production? What new thinky toys have you discovered that work for the 5 — 10 age range?