Two formations of smaller objects came together to form two larger objects disappeared and reappeared miles away.

My wife and I witnessed 2 groups of 3 sphere shaped objects sitting stationary in triangle formation. The two triangle formations of 3 objects each, were at the same height hovering next to each other at what seemed like 5 miles away. The first formation of 3 objects moved together to form one larger object and disappeared and shortly after the second formation did the same. Thirty seconds to a minute later two objects that seemed to be the same size as the final larger shaped objects that formed out of the original formations, appeared much further left on the skyline but at the same distance flying the same direction and varying speeds until going out of view.
Witness does not indicate a date for the sighting; elects to remain totally anonymous.  PD