Point, Line, Triangle, Square

Observed what I thought were circling birds off in the distance to the north as if there were a dead animal on the ground about half a mile away. Looking closer, I saw the birds change into metallic spheres. All but one disappeared, then another materialized and lined up next to it, fading in from the east. Followed by another fading into view above the two, forming an equilateral triangle. Then as the three in triangle formation spun counter-clockwise, a fourth appeared forming a square. Then they all disappeared.