Final answer:
The architect of the mixed use residential and office tower with 140 capsules completed in 1972 is Kisho Kurokawa, a proponent of the Metabolist Movement.
Step-by-step explanation:
The architect responsible for the mixed use residential and office tower completed in 1972, which features 140 self-contained capsules that can be removed, connected, or combined, is Kisho Kurokawa. Known for his innovative designs, Kurokawa was a leading Japanese architect and one of the founders of the Metabolist Movement. This particular building, the Nakagin Capsule Tower, is a prime example of Metabolism, showcasing the ability to adapt to changing needs by allowing the capsules to be individually installed or removed.