It happened while I was exploring the possible action in a "channel" in a possible "lock". I was worked ?under? the ?idea? or ?theory? that space makes the ?lock?. ?Vanes? entered the picture. Matching evolved to spliting.
I was not yet up to the point where one was going in as one was going out. I had started with a square too. But there it was. I was now stuck with triangles that still form squares.
To fix or lock the ?lock? everything must be ?locked? together. If not in this ?channel? then the one next to it.