I stitched together two photographs to get this tall view. It is, like almost all other cave formations both here and in Ondal Cave, a flowstone formation. The small pillars are draperies that have flowed down and joined together, ending at tiers formed by drip splash. New draperies form from these canopies and the process continues until the floor is reached.
At least I am guessing that this is how it was formed. I did not see any similar flowstone formations that were free-standing stalagmites—they were all attached to the walls. This would lead me to believe that they were formed from the top down, rather than being built up by drips from the ceiling. Not being an expert on speleothems (cave formations formed by deposits left behind by water), though, this is only a guess.