Unidentified Ball in The Sky, UFO 2016ufo 0 4 49 Embed
We are talking about flying objects, flying at super-fast speeds, many times greater than the speed of sound. Moreover, these objects, at times, up to several tens of centimeters, can fly by people just walking in the park. Basically it is a UFO-type rod or ball of light.
It is possible that there are flying unidentified objects that are not visible to the human eye. They are surrounded by a field of reflecting or refracting light. Such masking hides from unwanted viewers and to monitor in close proximity to populated areas.