Most would be led to think that every U.F.O. they and others see is the product of a distant alien. I believed this for a while until I started looking into the proof that humans have been creating flying saucers since world war one.
In recent times, dating back to the 1940s and 1950s, Humans have patented "vertical take-off and landing aircraft. These are circular-winged aircraft built to move with reflex in any direction: forward, backward, left, right and diagonal in any direction - more like being able to shift to any point within a bubble rather than a winged plane's very limited forward and side motions.