Wikipedia
Capsela was a construction toy brand consisting primarily of gears and motors in spherical plastic capsules that could be connected to form various static or dynamic toys suitable for land or water. The capsules usually have six hollow octagonal connectors pointing out, where an octagonal sleeve piece bridges between two capsules. The hollow connection pegs on a capsule can have electrical or rotary adapters inside, reaching into the next capsule. There are electric motor capsules, gear capsules, switch capsules, pontoon capsules, and others; there are also battery holders, wheels, propellers, impellers, lights, wires, and other miscellaneous supporting pieces.
Capsela products were originally manufactured by the Mitsubishi Pencil Company. The series was then licensed out to Play Jour and has since been produced by VTech, Kidology, and a number of other subsidiaries. The range seems to have been recently re-released in Japan by Bandai, adding new colours to the basic range of transparent spheres.
In the U.S., the Capsela line was purchased by Educational Insights, a manufacturer of learning toys and educational materials for school classroom, which has discontinued the line.