I specialize in architecture.
Something really fun that's good for passing time (aside from drawing) is origami.
The Super Machine is really big and it can carry many people and nothing can defeat it.
For this I used a red colored pencil and inverted my drawing on Photoshop. In the dream, everything is black and I can't see anything, only feel it. Here I outlined everything I can feel so that it can be seen.
This is a drawing of the ocean. It shows all the different zones of the ocean. It also shows animals that live in those zones. At the top is the sunlight zone. Next is the twilight zone. After that is the midnight zone. The last is the abyssal zone.