Do you see pictures on the wall?
No, there is a mirror on the wall.
    src        edge_attr  dst
0     1   to the left of   15
1     1   to the left of   13
2     1  to the right of    8
3     2  to the right of   16
4     2               on    3
5     4  to the right of   15
6     4   to the left of   10
7     4  to the right of   13
8     5               on    3
9     5   to the left of   16
10    6     reflected in    5
11    6   to the left of   16
12    7  to the right of   16
13    7     reflected in    2
14    8               in   12
15    8   to the left of    1
16    9  to the right of   14
17   10               in   12
18   10  to the right of    4
19   11   to the left of   14
20   13   to the left of    4
21   13  to the right of    1
22   14   to the left of    9
23   14  to the right of   11
24   15  to the right of    1
25   15               in   12
26   15   to the left of    4
27   16               on    3
28   16  to the right of    5
29   16   to the left of    2
30   16   to the left of    7
31   16  to the right of    6