For roughly 6 months to a year I will get into a hobby and really enjoy it. I tend to construct what I want and then move on to something else that sounds cool.
Its not quite at random - I have a long list of things that sound really fun! I also enjoy learning how to do new things.
Sewing? I've never made pants before but that sounds cool. Leather work? Lets make something that will last longer than most things made today. Horology? Let make a cool watch. Why not?