What would be the effect of decreasing the distance between the objects?

-- They would appear larger to each other.

-- They would sound louder to each other.

-- They would smell stronger to each other.

-- They could play 'catch' more accurately.

-- Each of them would attract the other one with a stronger gravitational force.

-- If either or both of them is electrically charged, then the present attractive

or repulsive electrostatic force between them would be greater.