While checking out a bad thunderstorm that was going by, I observed 3 grey/black coloured spheres spinning around in a clockwise motion, then forming into a triangle shape.
It appeared to be one object as it flew slowly under the clouds, twisting and turning slightly at times but always keeping the triangle shape.
Once in triangle formation, the area between the spheres was completely transparent even though they flew as if they were all connected together.
It was silent and did not leave any type of fuel trail behind it. It floated off out of sight after about a minute.