Are both the shelf that is made of metal and the office chair gray?
Yes, both the shelf and the office chair are gray.
    src        edge_attr  dst
0     0        on top of   10
1     0  to the right of    1
2     0               on   10
3     0  to the right of   11
4     0   to the left of   16
5     0   to the left of   12
6     1        on top of   10
7     1   to the left of    0
8     1   to the left of   11
9     1   to the left of   16
10    1               on   10
11    1   to the left of   12
12    2          wearing    5
13    2          wearing    8
14    3  to the right of   13
15    3            above   15
16    4   to the left of    7
17    7  to the right of    4
18    9  to the right of   10
19   10   to the left of    9
20   11   to the left of    0
21   11  to the right of    1
22   11        on top of   10
23   11   to the left of   16
24   11   to the left of   12
25   11               on   10
26   12        on top of   10
27   12  to the right of    1
28   12  to the right of    0
29   12  to the right of   11
30   13   to the left of   15
31   13   to the left of    3
32   15            under    3
33   15  to the right of   13
34   15        on top of   10
35   16  to the right of   11
36   16        on top of   10
37   16  to the right of    0
38   16  to the right of    1