Quoted from pinwiztom:WMS might have started it all in Woodrail era in 1949 with De-Icer, at least the top third of PF is significantly asymmetrical.
Odin's WMS Pinky some months later (in 1950) was truly asymmetrical top to near bottom.
And Harry didn't stop there. During the early 50s he released a series of single flipper games all with asymmetrical layouts. Then others that had features like ramps, habitrails, kicker lanes, on playfield bagatelles, you name it.
Hey, when you're the boss, you get to do whatever you like.
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