House sized cube on axis, colored lights pulsing, moving slowly about 25 feet off the ground

Five people witnessed a cube on an axis, like a Rubric's cube tilted on a corner. It glowed squares of color, and changed color, pulsing bright to low lights.The colors were primary colors. It moved slowly along a valley , above the trees, near a creek-it seemed to follow the creek bed. It was almost as large as a house. I did not witness this- my friend did- but he is dismissive about it. I think he saw something unusual, he is not the type to go off into flights of fancy.He says his wife and sister saw it too, along with others.
Date is approximate.  We have requested more information about the sighting.  PD