Puzzle

You are sitting in a round low-ceilinged room with one window.
Thru your window
you are watching 3 persons
standing round a triangular table
inside a huge blue dome.
These 3 are trying to fit together
the pieces
of a 3-dimensional jig-saw puzzle.
The pieces are rotating and revolving
in private eliptical orbits
within the dome.
They still have not fit any of the pieces together.
The first person is laughing.
The second person is crying.
The third person is staring
at you.