What do you think is located on top of the roof?
The clock is on top of the roof.
    src        edge_attr  dst
0     1   to the left of   14
1     3  to the right of   11
2     3  to the right of   21
3     4   to the left of   12
4     4   to the left of   10
5     6        on top of    0
6     7  to the right of   21
7     7  to the right of   11
8     9        on top of   17
9    10  to the right of    4
10   11   to the left of    7
11   11   to the left of    3
12   11  to the right of   15
13   12  to the right of    4
14   13  to the right of   15
15   14  to the right of    1
16   15   to the left of   21
17   15   to the left of   16
18   15   to the left of   13
19   15   to the left of   11
20   16  to the right of   15
21   18     hanging over   17
22   21   to the left of    3
23   21   to the left of    7
24   21  to the right of   15