Do the shelf and the wall have the same color?
No, the shelf is black and the wall is white.
   src        edge_attr  dst
0    0  to the right of    6
1    2               on    5
2    2               on    1
3    3  to the right of    6
4    3               in    2
5    6   to the left of    3
6    6   to the left of    0
7    7               in    2