If you look at the floor, you can see that the house was built around the rock. My bet is that they found the rock while digging out the basement. Options were $15,000+ to remove it, or $0 to just dig around it.
It's an AI image. There's a lot of impossible patterns and geometry here. Look at the floor under the rock and the pattern on the bedsheets lol. Also the ceiling is curving and the rock would be clipping into the wall from this perspective.
Nevermind the bolder, what is going on with random boxes on the ceiling? Did the architect forget to include the ductwork in their design or something?