Is there smooth sand in the picture?
Yes, there is smooth sand.
    src        edge_attr  dst
0     0  to the right of   12
1     0  to the right of   10
2     0  to the right of   13
3     0  to the right of    2
4     0   to the left of    7
5     0  to the right of    6
6     1   to the left of    7
7     1  to the right of   10
8     2   to the left of    0
9     3  to the right of   10
10    3   to the left of    7
11    5           behind    7
12    6   to the left of   12
13    6   to the left of    0
14    6   to the left of   13
15    7               on    4
16    7      in front of    5
17    7  to the right of   10
18    7               in    4
19    7  to the right of    0
20    7  to the right of    3
21    7  to the right of    1
22   10               on    4
23   10   to the left of    0
24   10   to the left of    1
25   10   to the left of    3
26   10   to the left of    7
27   12   to the left of   13
28   12   to the left of    0
29   12  to the right of    6
30   13   to the left of    0
31   13  to the right of   12
32   13  to the right of    6