4 circular cloud-like lights moving in a circular motion , rotating methodically, then meeting in the centerI went outside to do chores 2118 on December 18, 2001. I looked up in the sky and saw 4 circular cloud-like lights moving in a circular motion , rotating methodically, then meeting in the center and then splitting apart. I ran in the house and got my 14 and 10 year old son. They also saw the same thing I did. It gets brighter or more sparkling in the center, then fades intermittently. We thought we heard a humming noise, but as we got closer the formation moved away . It was hard to guage distance. We were able to continue to observe it for more than 40 minutes. When we last looked at it, you could faintly see it in the sky. It had faded considerably, then disappeared.((NUFORC Note: We suspect a rotating advertising light may have been the cause of the sighting. PD))((FOLLOW-UP COMMUNICATIONDear Ms. ((deleted)),Thank you very much for the report.Based on what you have written, I presume that the sighting you experiencedwas caused by a four-light advertising device. We receive reports aboutthem on a somewhat regular basis.Thank you for sharing the information with our Center.Cordially,Peter Davenport((RESPONSE))PeterWell that may be a possibility, but I live in the country and there is noway that could be the case.