The first one I saw was in that round space in the middle, hanging down. "WHAT IS THAT!?" I said:
We went around and saw the whole plant, and some others on that big, old tree.
Above right and below the sunshine:
There's a part sticking up, and some hanging down, and a fatness in the middle.
They grow on trees, but they're not parasites. They can grow on rocks, or when people buy them to grow at home, they're glued onto boards, to be hung on a wall, for starters.
Later that day we saw a big one, low, at the tropical fruit station: