@nprofile1q... in a way? But like, even within a framework of math, there are stuff you may want to toy around. Like, say with bridges, you might want to have a go at designing some kind of new bridge type - you're still working within the math, and seeing whether you can make your idea work, even if in some hypothetical scenario or not. Like, that's still a project, even if it doesn't enter into the physical world in any way, and I would very much count that.