Radar-visual sighting dur. 20 minutes - audio tape from ATC by experiecend pilot of two intelligent lightsI am an experienced commercial pilot/flightinstructor. From a Piper Archer II I saw one light flying. After a while it turned 130 degrees. I contacted tower and nothing was known or seen on the radar. After a while a second light appeared. I flew to them not able to close them further in. They disappeared and when the appeared to hear the communication, they returned and I flew towards them again, which game lasted and lasted. They appeared to be intelligent lights which seemed to overhear the radio communication. I have an audio tape of it from the air traffic control.At one time the radar controller says to the tower controller - over the intercom- which I could not hear in the airplane at the time - : two objects, three miles at his twelve o'clock position. Tower asked me what I saw at the time and I reported : the two lights are now 12 o'clock, three miles. The channel silenced down and surprise was the master at that particular time. Later on I saw one light disappear between the stars.I know how high airliners go, I know satellites, I know the weather which was clear sky with hundreds kilometers of sight. On the ground was fog only up to 200 feet from the ground. They were no natural explainable things, because I read a lot of them and my response: No way José! At the time I did not believe in UFO's and still I find it hard to believe, but I must admit: they were spirits or UFO's! I will remain my further life in a mystery, which I saw that time.((NUFORC Note: This appears to us potentially to be a serious-minded report, but the e-address that the witness provides is not valid. We would very much like to correspond with this witness. PD))