Our friends Andrew and Nooshi are similarly resistant to battery-operated toys so a visit to their home typically guarantees learning about some nifty, classic toy options. Laurel and Jack couldn’t get enough of this Choral Top ($16.95 at Amazon). The pump action creates a whirl of bright color and triggers the sounding of harmonious tones. The latter vaguely reminded me of some of the experimental stimuli I used to monkey around with during my research days, but I won’t hold it against this cool classic.