Man Finds Supposed Hindu Relics In River

What Are They?

A man named Will Read was fishing with his two children when he found a strange cube in the water. The cube had numbers and inscriptions all over and looked very, very old. He then kept finding more and more, all in the same place. He ended up finding 60 of these mysterious cubes and took to the internet to figure out what they were.

People on Reddit gave their own theories and Will eventually concluded that they are probably old, Hindu artifacts related to traditional prayers. He has made several trips to the river to find more information but hasn't found anything and nobody knows the true purpose of these cubes. What do you think?