2-3 colored lights on one craft swooping gracefully in irregular pattern looking west/nw from North Portland, ORfrom North Portland on the second story of a building, looking fairly high into the western/northwestern sky around 8pm, my friend and I saw lights, multiple, changing colore - red, blue, green -- apparently one craft, making swooping, rolling moves. Perhaps two lights or three, with colors changing. Appeared to be on the other side of the Willamette - perhaps far away to the west/northwest. It swooped down, and to one side, then up, to the other side - graceful slow movement. Finally, as I was talking to the local news station (KATU-TV)it gradually dropped toward the horizon, at a curving angle until I could not see it anymore behind the trees and tall house to west of our building. Appeared rather far away, could only make out the movement and the colored lights (no more than 3 clustered together in no discernible shape).