Gordon Brander: I was very much interested in systems theory. In settle custom it is reducing about reducing complexity from the outside to be able to build up complexity internally. It took me a while to understand that this is more than just a quirky way of taking and organizing notes. Zernka, could you introduce the like zettel caston? Slip box. How do we think about it? Sure. We've got a bunch of bookmarks here. This is sort of my heat map of insights and one more little thing here. The idea maze of this problem space you can sort of see maybe in this camera.