Japan is one of the countries that is very good in maximizing space. Since the country is relatively small, their buildings are built with the number of storeys below as much as they have above. If it is 65 storeys high, it is also 65 storeys below.
Population is ever growing but the living space is relatively getting smaller as each generation grows. Houses lack rooms yet the stuff people accumulate are piling up. That is why walls and ceilings are now used to maximize the space. tv stands with mounts are also popular these days to be able to have room for moving around.