What’s a book that completely changed your perspective on something?

We read for fun, but sometimes a book comes along that fundamentally shifts how you see the world.

For me, it was "Braiding Sweetgrass" by Robin Wall Kimmerer. It completely reshaped how I view my relationship with the natural world, moving it from a resource to manage to a family to belong to. It was a beautiful, profound shift.

I'm curious about the books that have done this for others.