Originally posted by GunsForBucks:

I totally have no idea what you are talking about.

A wall piece has two sides: a plain (smooth) side and a busier (horizontal slats) side.

EDIT: It always annoys me the slat on the 1/2 wall NEVER LINES UP with the slat on the full wall ... It seems like it needs to be flipped 180 about the horizontal axis to work.