An answer in Linguistics led me to investigate the radicals composing the written word 'right' (右), which led me to the stone radical (石). There is a very subtle (to me) difference in that the lines cross for the former case but just touch in the latter case. Is there an etymological connection between these?
Also, while I can see that the stone radical seems to be composed of the cliff radical (厂) and either the enclosure radical (囗) or the mouth radical (口)*, I cannot find the radical that's like cliff but crosses, as in 右.
* While I can see the mouth is narrower, those are far too subtly different for me to distinguish