A top official at the National Park Service says a liner along the bottom of the Lincoln Memorial Reflecting Pool was cut with a sharp knife or razor this month, causing damage to the foam sealant installed as part of a $16 million rehabilitation project.
Ever see paint peel? It often peels in straight lines. It’s not a razor but because of the molecular structure of paint and how it “settles/spreads”.
And like how cracks and fissures work. It’s always lines. That’s physics.