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Every art, like our own, has in its composition fluctuating as well as fixed principles. It is an attentive inquiry into their difference that will enable us to determine how far we are influenced by custom and habit, and what is fixed in the nature of things.

sir Joshua Reynolds (1853). “Discourses on the Fine Arts Delivered to the Students of the Royal Academy”, p.31
Every art, like our own, has in its composition fluctuating as well as fixed principles. It is an attentive inquiry into their difference that will enable us to determine how far we are influenced by custom and habit,