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Throughout the scientific revolutions of the 17th Century, color was dismissed, along with other aesthetic properties like scent, as a secondary quality — that is, one lacking the explanatory role in the behavior of physical objects of so-called primary qualities, like motion or size or shape.

Primary qualities are objective; secondary qualities are subjective, in that they depend on our ways of sensing.

This bus has primary qualities of solidity and space occupancy that exist independently of our perceptual machinery and that can do us injury.

Primary qualities of an object, such as solidity and occupancy of space, exist independently of a perceiver.

His primary qualities are technique and vision.