Iron Cube vs reality
Looks like the trees from Iron Cube are real
It turns out the trees from Iron Cube exist.
The photo above is an avenue in a park where the trees are clipped into tall green boxes on bare trunks. They stand in straight rows on both sides of a mown lawn, with a gravel path crossing in front.
In Iron Cube every tree is a brown voxel trunk with a green block on top, which is about the simplest tree a voxel world can have. Someone has grown and trimmed the same shape for real.