“The 20th century scholar and mystic, Henry Corbin, named this inner realm the ‘mundus imaginalis’ or world of images. He describes this as “a truly real though subtle landscape located in a third domain that is neither precisely spirit or matter, but lies somewhere in between the purely intellectual world of angelic intelligences and the sensible world of material things and participates in both”. He found this world was spatially within a person’s body and also a distinct region of the cosmos.”
https://www.selfsoulcenter.org/soulwork-the-mundus-imaginalis-introduction/