Do I need original-cell? Like what if I just did

(cell= (dosync
  (reset! cell1 (value-fn-1 cell2 cell3))
  (reset! cell2 (value-fn-2 cell1 cell3))
  (reset! cell3 (value-fn-3 cell1 cell2)))) 

Where those value-fn functions compute the value of one of the cells based on the values of the other two or whatever.

it would add the watches i think, but could result in a cycle

sorry i didn't have a chance to make an example for you, will do asap

@jamesvickers19515 yes it will add the watches for you, however that would no longer be a lens cell

cell= has 2 arguments the first is the cell to watch which updates the value for cell= the second is a callback that should be invoked when trying to update the cell=

your example would create an infinite loop