What's the floor made of?
The floor is made of concrete.
    src        edge_attr  dst
0     0  to the right of    4
1     0  to the right of    8
2     0   to the left of   10
3     0  to the right of    7
4     0  to the right of    3
5     0  to the right of    1
6     1  to the right of    3
7     1   to the left of    0
8     1  to the right of    8
9     1  to the right of    7
10    3  to the right of    8
11    3   to the left of    0
12    3  to the right of    7
13    3   to the left of    1
14    3   to the left of    4
15    4  to the right of    3
16    4  to the right of    7
17    4   to the left of    0
18    4   to the left of    9
19    4  to the right of    8
20    5            below    6
21    5           behind   11
22    7   to the left of    4
23    7   to the left of    3
24    7   to the left of    1
25    7   to the left of    0
26    8   to the left of    0
27    8   to the left of    1
28    8   to the left of    9
29    8   to the left of    3
30    8   to the left of    4
31    9  to the right of    4
32    9  to the right of    8
33    9               on    2
34   10  to the right of    0
35   11      in front of    5