what are you looking at what are you looking at?

"I now exist as myself for my unreflective consciousness. It is this irruption of te self which has been most often described: I see myself because somebody sees me."
(J.P. Sartre: Being and Nothingness)

Hearing footsteps behind him/herself, a voyeur being caught peeping through a door, becomes self-conscious that someone else is looking at him/her. This 'irruption of the self', as Satre calls it, makes us aware of ourselves by being discovered by someone else.

Étant donnés: 1° la chute d'eau / 2° le gaz d'éclairage

The real subject of the Marcel Duchamp's Étant donnés  is not the naked woman with her enlightened vagina, but the spactator, peeping through the door.
I see myself because somebody else sees me.

Con celui qui voit.