This chapter delves into the intriguing idea of our universe possibly existing within a black hole, with a focus on the similarities in the mathematics of black hole interiors and exteriors. A physicist from CERN contemplates the concept of black holes as seeds for baby universes in a multiverse setting, raising thought-provoking questions about gravity and the nature of our universe. The discussion expands to the effects of gravity at different scales of black holes, exploring the potential scenario of our entire observable universe existing inside a black hole.