What's the floor made of?
The floor is made of brick.
    src        edge_attr  dst
0     0  to the right of    8
1     0   to the left of   15
2     0   to the left of   11
3     1  to the right of    4
4     3               on   12
5     4   to the left of    1
6     5  to the right of   15
7     5               on   12
8     5  to the right of   14
9     6  to the right of    9
10    6   to the left of   17
11    7  to the right of    8
12    8   to the left of    7
13    8   to the left of    0
14    8   to the left of   16
15    8   to the left of   11
16    8   to the left of   15
17    9               on   12
18    9   to the left of    6
19    9   to the left of   17
20   11  to the right of    0
21   11  to the right of    8
22   11   to the left of   15
23   13               on   12
24   13   to the left of   17
25   14               on   12
26   14   to the left of    5
27   15               on    3
28   15  to the right of   11
29   15  to the right of    8
30   15   to the left of    5
31   15  to the right of    0
32   16  to the right of    8
33   17               on   12
34   17  to the right of   13
35   17  to the right of    9
36   17  to the right of    6