Which kind of furniture is on the wall?
The piece of furniture is a shelf.
    src        edge_attr  dst
0     0  to the right of   16
1     0   to the left of    9
2     0   to the left of    8
3     0   to the left of    7
4     0  to the right of    2
5     1  to the right of   12
6     1  to the right of   17
7     1  to the right of   11
8     2   to the left of    0
9     3               on    2
10    4               on    0
11    7  to the right of    0
12    8  to the right of    0
13    9  to the right of    0
14   10  to the right of   13
15   11  to the right of   17
16   11   to the left of    1
17   12  to the right of   13
18   12   to the left of    1
19   13   to the left of   12
20   13   to the left of   10
21   16   to the left of    0
22   17   to the left of    1
23   17   to the left of   11