What is on the wall that is presented in this photo?
The envelope is on the wall.
    src        edge_attr  dst
0     0  to the right of    4
1     0  to the right of    3
2     0  to the right of   16
3     1   to the left of   13
4     2  to the right of    5
..  ...              ...  ...
65   21   to the left of    9
66   21               of   20
67   22   to the left of   18
68   22  to the right of   11
69   22   to the left of    7

[70 rows x 3 columns]