It all the stars and planets are around, then there should not be any reason why Nature could not make these two round cobbles, although I was a bit perplexed initially. These round samples are rare, most of them are irregular. They were from different upper streams of Sarawak rivers. These cobbles are all sandstones, the grey one is coarser than the light grey one.
Humans probably can also make the round samples too, by sanding or machining.
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