> I think certainly the direction of copying is geos copying from Mac.

Given that the Mac shipped with those patterns in early 1984 and GEOS in 1986, it can’t be Mac copying GEOS.

That doesn’t mean it was GEOS copying Mac, though. Various horizontal and vertical stripes, block patterns and attempts to get a range of grays easily can be parallel evolution. 27 out of 32 seems a bit much, though.