I still have my BanDai SpaceWarp that I got in the 80's.
Sometime around 1972, I had a set that was sort of an ancester of the current MarbleRun sets. It consisted of pieces that were molded from translucent plastic. The colors were blue, yellow, green, and red. It had cubes with 9o degre elbow in them. Some flatter square connecting pieces, and ramps. I cannot remember who made it, or what it was called.