mwm64 Lv 1
I just now filled out the form so you can mention me :-)
The idea was that that you can make a pattern of hydrophobics and polars on the outside of one sheet, and make a matching one (mirrored, rotated 90 degrees, and reversing polarities) on the other sheet so they match up. It turned out to not be quite that easy (the grids aren't quite square, etc.) but that was the idea.