Light is not a subject , it is a none subject since it is omnipresent, ineluctable, necessary. But when does it become a medium?

– When its specific use allow to open a field of perception of space and time that the building alone (meaning its arrangement and form) can not allow.

– When coupled with other elements such as water, air, sound, it allows the definition of the ultra sensitive interfaces. Theses interfaces create some visual stimuli with an organization and mean of apparition that confer to the building a presence or a reality that it can not have without.