Did it only disappear after you looked directly at it?
It manifested, floated in front of me for about 2 seconds, turned its head toward me, raised its arms and in about another second or two, wafted into the air, disappearing.
It would have been creepy were I not a skeptic. Paranormal believers would have freaked out I think and would try to justify it being something supernatural. I know exactly what it was.