Does the drum have a different color than the wall?
No, both the drum and the wall are white.
     src        edge_attr  dst
0      0  to the right of   14
1      0  to the right of   22
2      0  to the right of   20
3      0  to the right of   11
4      0  to the right of    3
..   ...              ...  ...
135   23   to the left of   10
136   24   to the left of    6
137   24   to the left of    2
138   24  to the right of    8
139   24  to the right of   23

[140 rows x 3 columns]