Sea pansies bury their bulk in the sand and extend these tentacles up, to grab food as it swims by, I assume. This is just a tiny part of the pansy, which might have 100 or so tentacles over a region the size of the palm of a hand. The buried bulk is a disc, with a sort of indented cusp on one side: it looks a little like a flower. Sometimes surge will wash sand away and the pansy will flop around in the currents. I suppose that they must be colonial animals, sharing one body.