The space is filled with ovoids of light. People move through the ovoids and enter the space.

When an ovoid is pushed, the color of its light changes, and it emits a sound tone specific to that color. The light  resonates out to other ovoids nearby. The sound tone resonates out continuously in the same way as the light, spreading throughout the ovoids in the space.

If a wave of light comes from the other side of the space, it signifies that there is another person there. As a result, people gain a heightened sense of awareness of the presence of others in the same space.