The heart rotted away while the tree still stood, leaving these sculptural lobes. The hollow is not damage, it is the design.
Read from the heart outward. Move your finger across the rings. Every ring is a year that actually happened.

The North End of Winnipeg, at Selkirk Avenue and McNichol. The circle marks the block it grew on, not the exact yard.
Every Russian olive piece in the shop came out of this tree.