What do the window and the stone have in common?
The shape, both the window and the stone are round.
    src        edge_attr  dst
0     0  to the right of   12
1     0  to the right of    1
2     1  to the right of   12
3     1   to the left of    0
4     2   to the left of    8
5     6  to the right of   17
6     6  to the right of   19
7     6  to the right of   16
8     6        on top of   15
9     7  to the right of   17
10    7  to the right of   16
11    7  to the right of   19
12    8  to the right of    2
13   10               on   15
14   11   to the left of   14
15   11   to the left of   15
16   12   to the left of    1
17   12   to the left of    0
18   14  to the right of   11
19   15  to the right of   11
20   16   to the left of    7
21   16   to the left of    6
22   17   to the left of    7
23   17   to the left of    6
24   17        on top of   15
25   19   to the left of    7
26   19   to the left of    6