Secondary Qualities (Galileo)

Secondary Qualities (Galileo) Other properties, however, such as an object’s colour, sound, taste or smell may be altered or removed without affecting its physical existence, and these he concludes must be secondary or ‘accidental’ Keith Wilson. In his Assayer of 1623, Galileo explained his notion of the difference between those qualities, mostly found by touch, that are inherent in bodies (weight, roughness, smoothness, etc.) and those that are in the mind of the observer (taste, color, etc.)--in other words, the difference between what we call primary and secondary qualities. Albert van Helden, The Galileo Project.