Are there any plates on top of the shelf?
No, there are books on top of the shelf.
    src        edge_attr  dst
0     0   to the left of   14
1     0  to the right of    6
2     0        on top of   18
3     2   to the left of   16
4     3   to the left of   21
5     3  to the right of    8
6     4   to the left of   16
7     5  to the right of   16
8     6   to the left of    0
9     6   to the left of   21
10    8        on top of    9
11    8               on    9
12    8   to the left of    3
13    8   to the left of   21
14    9   to the left of   21
15   10        on top of   18
16   10   to the left of   20
17   10   to the left of   16
18   14   to the left of   16
19   14  to the right of    0
20   16   to the left of    5
21   16  to the right of    2
22   16  to the right of   20
23   16  to the right of   17
24   16  to the right of    4
25   16  to the right of   14
26   16  to the right of   10
27   16        on top of   18
28   17   to the left of   16
29   17        on top of   18
30   17   to the left of   20
31   19  to the right of   20
32   20  to the right of   10
33   20   to the left of   16
34   20  to the right of   17
35   20   to the left of   19
36   20        on top of   18
37   21  to the right of    9
38   21  to the right of    8
39   21  to the right of    6
40   21  to the right of    3