and yet the difference is as impossible to erase from the eye as the histor

There is something vastly mysterious for me about the shift one sees, along that route, from the Islamic world to the Christian, from the Ottoman to the Austro-Hungarian, from the Muslim to the Catholic and Protestant. It is a gradation of towns, of architecture, of gradually receding minarets blended with the advancing church domes, of the very look of forest and riverbank, so that little by little you begin to believe you can read in nature itself the saturation of history. Does the shoulder of a Turkish hillside really look so different from the slope of a Magyar meadow? Of course not, and yet the difference is as impossible to erase from the eye as the history that informs it is from the mind.

Please tell me what's the last sentence means "and yet the difference is as impossible to erase from the eye as the history that informs it is from the mind."

Thanks