0,0 tree_tl1
1,0 tree_tr1
2,0 tree_tl2
3,0 tree_tr2

0,1 tree_ml1
1,1 tree_mr1
2,1 tree_ml2
3,1 tree_mr2

0,2 tree_bl1
1,2 tree_br1
2,2 tree_bl2
3,2 tree_br2

0,3
1,3
2,3 skull_top
3,3 skull_ftop

0,4
1,4
2,4 skull_base1
3,4 skull_base2