Hi, I've been looking through the Pico-8 manual, and found this:

The bottom half of the spritesheet and bottom half of the map occupy the same memory.

What uses can this have? I can't really think of anything personally but there must be some.

I'm not sure it has a 'use', other than to provide an interesting limitation for the virtual console:

More sprites, or more map?

Ahh I see.

Having said that, knowing how clever some people are, I wonder if there are some interesting ways of making use of the shared space. Perhaps you could have something get added to the map, and then that thing is available to use as a sprite.

Yeah, or the reverse.

Some people use the map space to encode other game data, to get around size/token limitations.