Woodworking is one of my many non-technical hobbies, used to switch off from the world. In particular, I will set out to make a 'thing' of non-critical nature, and abandon all measurement equipment. I'll still use a marking gauge without index markings, allowing me to mark a straight line, or a half way point, but that's it. Removing numbers from the process, for me, is a fantastic way to switch from an engineering mindset, to a purely creative one.