I have seen four. These are for real but only one has been identifeid. The first was in the summer of 64 in Vestal NY. A 4 inch snowflake was within my grasp yet would allude caoture as if by magnetic repulsion. (this was identified at U of R as a rare flying web spinning aphid)

The second was clearly a solitary plant near the base of Cayuga Falls NY. It was on a thick 4 1/2 ft. stalk with no leaves and a globe about a foot in diameter on top of a silvery purple color.

The third may be in a genre outside a lifeform but there were 2 seperate 6 in. globes of light that emerged right though a brick wall into our back room at 23 Strathallan Pk Roch. NY. I was fascinated and touched one but the cat was frightened with its hair on end,

The last was actually my first as a yound child. On a clear day I would see rapidly flashing "things" go by. It would frighten me that adults could not see my "lightning beings". Nowadays some would say these could have been 'rods'.