This rendering created by DN8 and provided by ODA Architecture shows a living tree situated in an infinity pool inside a private residence designed by ODA in New Delhi. (ODA Architecture via AP)

This photo provided by KAA Design Group shows the Tree House's primary suite private courtyard with Japanese wood soaking tub and reflecting pool. (KAA Design Group via AP)

This image provided by KAA Design Group shows an angle of their Tree House project in California. (KAA Design Group via AP)

This photo provided by KAA Design Group shows the second floor cantilevered office of the Tree House in California. (KAA Design Group via AP)

An indoor waterfall is situated in a five-story high indoor forest filled with trees and plants at Changi Jewel Airport in Singapore. (Natalie Chin via AP)