As “invented” by the 5 year old. We’ve had these Interstar blocks since he was 2, and they have been *by far* the best toddler toy we’ve bought.
Because you have to have something to do while you’re sailing. The almost-4-year-old calls our joint suspend-the-blocks-from-the-rigging effort his Remote Control Face. (There are little faces on a couple of the blocks. Also, he’s harbored a minor obsession with remote controls for several years now.)