What is on the wall?
The graffiti is on the wall.
    src        edge_attr  dst
0     0  to the right of   11
1     1       painted on    4
2     1  to the right of   11
3     1               on    0
4     2   to the left of   11
5     3   to the left of    6
6     4   to the left of    9
7     4             near    8
8     4           behind    7
9     4            below    8
10    6  to the right of    3
11    6  to the right of   11
12    6  to the right of    9
13    7      in front of    4
14    8             near    4
15    9   to the left of    6
16    9  to the right of    4
17   11   to the left of    1
18   11   to the left of    6
19   11  to the right of    2
20   11   to the left of    0