Stumped by a rock that appeared from nowhere.

https://www.independent.co.uk/news/science/nasa-says-mars-mystery-rock-that-appeared-from-nowhere-is-like-nothing-weve-ever-seen-before-9070323.html

 

Was it a not here one moment, here the next knit of thing?

Or a not here one morning, here the next day kind of thing?

ETA - never mind, photos taken 12 days apart.

From the article

"We had driven a metre or two away from here, and I think the idea that somehow we mysteriously flicked it with a wheel is the best explanation," Squyres said.