Yes, this is what I "re-invented" (I didn't know until now that it had a name). I saw it later in a math book that I flipped through on a co-workers bookshelf (

Yes, this is what I "re-invented" (I didn't know until now that it had a name). I saw it later in a math book that I flipped through on a co-workers bookshelf (but they didn't name it there either). Also, very cool, followed your link and they mentioned a 3D analog of sorts: https://en.wikipedia.org/wiki/Schwarz_lantern https://en.wikipedia.org/wiki/Schwarz_lantern