https://github.com/day8/re-frame/issues/579

Dominoes 2 and 3 can be written as a formula.

w' = f(w,e)

Not writen the way a Clojureist would like to see it.

Given the current state of the world w, and the occurance of an event e, the function f will compute the next state of the world w'.

XXX

There's a schematic formula for Dominoes 2 and 3.

w' = f(w,e)