Outside the forum of the treatise proper, what was referred to as perspective around 1600 was a large body of phenomena, dealing not only with goldsmithing and machines, but with alchemy and theology. It was also frequently imbricated with senses other than sight. For the Oxford occultist Robert Fludd (b.1574), perspective was one of the liberal arts, along with astronomy, geomancy, and music. In his colossal treatise, De Naturae
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