How do I make a hollow sphere?

[ClockworkOcean]

Yes, you can make a sphere that has thickness, and then cut it in two. And then put the two copies of one half around your play area.

1. Make a sphere

2. Duplicate it in place ( Ctrl-D )

3. Make the duplicate slightly smaller, scale it to .95

4. Use a bool operation to cut the smaller sphere out of the larger one

5. Use a plane cut to chop off half

Bob’s your uncle.