Circle of Knowledge eschews flashy whiz-bang toys in favor of products that make you think and create: brain-bending 3-D puzzles, a kit for brewing your own soda pop, a box of detective instruments. The Erysian family has been filling this niche in St. Louis' toy market for seventeen years. They offer items from about 350 vendors, with a preference for well-made toys from Western Europe, the United States and Taiwan. There's also a bit of environmental consciousness thrown in with the fun, as demonstrated by the organic dolls or the alternative-energy electric set (which kids can use to construct LED lightbulbs and windmills). Start 'em young, right?