Doing a bit of research is always useful. I had not really an idea what the triangular pieces were. There are quite a lot and they all pointed upward according to the instructions from Eduard.
Until I saw this picture with the parts in the upper left corner and it all made sense. They are use to store cables or firehoses and they have to point upward and downward.

Gijsbert
Until I saw this picture with the parts in the upper left corner and it all made sense. They are use to store cables or firehoses and they have to point upward and downward.

Gijsbert

























and get rid of the enormous amount of "stuf" that you collect during a lifetime and that you really will not use anymore when retired. So sometimes a painful proces, but mostly a nice feeling of relief...