What is the tray made of?
The tray is made of metal.
    src        edge_attr  dst
0     1   to the left of    2
1     1  to the right of    6
2     2               on    0
3     2  to the right of    1
4     3               on    1
5     3  to the right of    6
6     6   to the left of    1
7     6   to the left of    7
8     6   to the left of    3
9     7          wearing    8
10    7  to the right of    6