On which side of the picture is the shelf, the left or the right?
The shelf is on the right of the image.
   src        edge_attr  dst
0    1   to the left of    4
1    1  to the right of    3
2    2       mounted on    0
3    3   to the left of    1
4    4       mounted on    0
5    4  to the right of    1
6    6     reflected in    3