An empty room, no chairs, no light, no whatever.
An empty room, except for 2 people.
2 people, complete strangers to each other.
2 people in an empty room, saying nothing, just listening to the alternating sounds of breathing, with an occassional cough and sigh.
2 people, saying nothing, only breathing.
Breathing, which after a few minutes formed a perfect alternation.
2 people, walking around in a perfect circle, without them knowing.

They picked up each other's "actions", without knowing the other or having seen the other.
Just 2 people, complete strangers, walking in a circle towards each other.

Soon, their worlds will collide and become 1.