What is the box made of?
The box is made of concrete.
    src        edge_attr  dst
0     0               in    5
1     0   to the left of    1
2     0   to the left of    4
3     0      in front of    9
4     1  to the right of    2
5     1  to the right of    0
6     2  to the right of   12
7     2   to the left of    1
8     2  to the right of   11
9     4  to the right of   13
10    4  to the right of    8
11    4  to the right of    0
12    6               on    3
13    8   to the left of    4
14    9           behind    0
15   10   to the left of   12
16   10   to the left of   11
17   11   to the left of    2
18   11  to the right of   10
19   12   to the left of    2
20   12  to the right of   10
21   13   to the left of    4