The key is light
and light illuminates shapes
and shapes have an emotional power.
By the play of proportions
by the play of relationships
But also by the intellectual play
their authentic origin,
their capacity to endure,
astuteness, boldness, even temerity, the play
of those vital abstractions which are the essential qualities
the components of architecture.
From Chapter Two of Le Corbusier’s La Chapelle de Ronchamp, published in 1957