You are looking at a piece of modern art at a museum. As you look at the shapes on the painting, what part of the brain helps you understand if the lines are curvy or straight

Perceiving straight line as well as anything to be perceived has nothing to do with their physical relation to the brain. All reality constructs are created using synchronized oscillations, that is, rhythm code.

Even in primary visual cortex which is similar spacially to retinal surface, this is not because it has to reflect spacial relations such as distances, only because it reflects time relations between various parts of the outside world, with retina as mediator.

That's why it neither does matter that retina is also curved, nor that the visual projection onto retina is turned upside down - what matters are temporal relationships between changes occuring in the outside world, and these temporal patterns are what brain reads from input with great precision.

Straight lines are not only straight spacially, but they also have specific pattern of temporal relations of all its parts, which are translated into "straight thing" brainwave code.

You perceive music with exactly same part of brain that perceives straight line, that should be sufficient to see it's not about anatomy shapes.

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