Uhm, short answer: yes, of course I live in a cave!
Longer answer: The house I live in is built into a hill with a relatively steep slope. Not exactly like those hobbit-like houses people build, more like a rock fort that emerges out of the hill. The premise of the house was to celebrate the environment by preserving the trees and plants endemic to the area during construction, using the rock from the excavated area to maintain a material connection to the site and using rejected building material for the remainder of the house, and also expose certain parts, hence this chunk of earth.