What is the material of the door?
The door is made of glass.
     src        edge_attr  dst
0      0  to the right of   20
1      0  to the right of   17
2      0  to the right of    3
3      0   to the left of    1
4      0   to the left of   13
..   ...              ...  ...
256   32  to the right of   13
257   32  to the right of    6
258   32  to the right of    4
259   33  to the right of   30
260   33  to the right of    9

[261 rows x 3 columns]