Are there mirrors that are not round?
Yes, there is a rectangular mirror.
    src        edge_attr  dst
0     0            above    4
1     0  to the right of    1
2     0  to the right of    2
3     0  to the right of   17
4     0  to the right of    9
..  ...              ...  ...
65   17  to the right of    3
66   17   to the left of    0
67   17            below    1
68   18       sitting on    6
69   18   to the left of   10

[70 rows x 3 columns]