As for me
I just think about all the things I can make if I had the time and the space. I was thinking about a tilt ball arcade machine, an arcade machine where you use levers to tilt the surface of an obstacle course for a small plastic ball. The goal would be to get the ball through the obstacle course without falling down the end game chute.
It's something I think I can make because I can visualise how all the parts work. You would have a controller stick that is attached to a lever, the lever would connect to a pivot and pull a rod that moves the surface of the table that itself is resting on a hinge. If the pivot was low down then the lever would move with less force but have a smaller range of movements, if the pivot was higher up, the table surface would move more but it would feel more heavy. The key would be to find the sweet spot, a point were the lever doesn't feel too heavy to move but it still moves enough to control the ball reasonably well.
I write posts on here very often because I don't need any space and I used my traveling and standing time to write the posts. I draw the image at home straight after lunch while I wait for my coffee to cool down and quickly scan it.
If I was loaded like some of those rich spoilt brats, I would be more happy than them because I could have a workshop and build things in there. Perhaps as a room in a big house or a shed. Even this low level hobby brings me joy, I don't need other people's approval; it is nice that my thoughts pass into other people's minds around the world though.