Repetive movements of light for 90 minutesAround 230 am I noticed a lighted object across the lake from my house, whiched seemed to be just going back and forth in the same place and changing colors. It would move across the sky while green, pause for seconds, change to white, start moving opposite direction as it started moving again it became red in color. This went on for ninety minutes. Rarely changing height, barely above tree line across lake. I used three different devices to record its movements and when I tried to look at the videos this morning, nothing was in the sky. The house lights on overnight showed on the video, but no lights moving in the sky. Very puzzling to me. The devices were working fine. I heard no noise from the object, it just kept repeating this movement for the whole 90 minutes I was watching it.((NUFORC Note: Witness elects to remain totally anonymous; provides little contact information. PD))