Senses

Bringing light into places often hidden or concealed in the light, and revealing these places when in darkness.
Low stimulus spaces, quiet anechoic spaces.
The limits of what you could experience, or limiting the experience.

Researching into anechoic spaces/ chambers. The acoustics of the space create an almost limitless an vast space like you are high up in the open air despite the space being rather restricted in size, there are no reflections from the walls, floor or ceiling therefore tricking the mind into thinking you are surround by a vast space.
The space is immensely quiet, ideal for testing particularly quite sounds.
Due to the quietness of the space and its boundless surroundings it could be a perfect place of reflection, the sound of silence and the silent stretches of space.