Galt Toys - Marble Run Construction Toys

24 brightly coloured pieces in 4 different shapes to slot together into a marble run, plus 6 marbles. Kids love to watch the marbles roll down the chutes, disappear into the tubes, and reappear on the curves a few inches lower. Since it can be configured any number of ways, it's a great discovery and exploration tool, providing instant feedback in the cause-and-effect department.