That's where the monsters live! Why would I make that as a kids area?

When I was a kid we used the under-stairs closet that way. Didn’t need anything fancy, just something to sit on. We had a folding cot type of thing with a foam mattress.

Harry Potter's Aunt and Uncle had a degree of success with this for a while. :)

If the kids want a nook, make it an austere, but comfortable environment. Clean, safe from sharp objects, and then let them begin to build their own fort, and you follow suit.

What did you do for light? We had a plug-in lamp dangling from the ceiling, but the ceiling is already so low, it makes things feel cramped.

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My uncle put up a 2 foot wall, covered it with carpet, and put a ball pit on the other side

There was a bulb in a fixture toward the rear of the space, with a pull string.