One Piece, but i think we dont need two or three single Elements ?!
Personally, I don't find these a must - I rarely have need of MORE straight walls (will I?), and while it would be easier to build (as in faster)... I have some playmoebius parts, not properly tested yet, in truth
, but they feel more brittle and fragile than the original, so I would prefer to go with 2 or 3 original ones...
Of course, the one without the connector doesn't fall in that department, and counts as a new part, and as such.... welcome!
WALL with Window !!
Wow.
You should open a steckstore. (my wallet is making threatening noises, but that is usual... pay no attention...)