More more Architecture and Landscapes

I've recently come across this building in a small place called Kitayama in the city of Kyoto. An open air art gallery, the name of which escaped my memory, designed again by Mr Ando san. A handful of concrete planes deliberated, sized, scaled, calibrated, and detailed to create a series of sequences, openings and thresholds through the site; much like what your task is now.

Is this architecture, or simply a series of blades in an empty site? Or maybe at best a sculpture (monument?) blown into a massive scale? What then constitutes architecture? Is it an artifact that fully encloses or shelters? Or is the mere presence of structure sufficient?

Something unrelated: you'll find two extremes of architecture in Japan, i call this one Optimus Prime.