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(R)-1-bromo-1-chlorethanol and (S)-1-bromo-1-chlorethanol
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The initial view is with the R and S stereoisomers superimposed at the methyl, the alcohol and the central carbon. Notice that the clorine atoms is superimposed on the bromine and vice versa. ~
The button Relative Move set picking dragMolecule-Relative Move ~ executes the JSmol command set picking dragMolecule. Clicking on one of the molecules makes it active for translation (moving with the mouse or trackpad) or rotation (option/alt + mouse or trackpad movement). Clicking off the molecule restores normal mouse function. ~
 
 

select *; spacefill-Spacefill select *; spacefill 23%-Ball and Stick