Do you see a train below the sky?
No, there is a kite below the sky.
   src    edge_attr  dst
0    1        below    8
1    1  in front of    2
2    2       behind    1
3    3        below    8
4    3       flying    4
5    3           on    1
6    4           in    8
7    4        below    8
8    7           on    1