Abstract
One of the first—if not the first—colour order system described in the literature is that of the Swedish scientist Forsius in his book Physica, published in 1611, and the Symposium at which this article was presented was organised to provide a forum for discussion of the philosophy and principles underlying the various colour order systems that have been developed since that time. Two main types of colour order system can be identified, depending on the subjective variables of colour appearance on which they are based. These variables are discussed in this article with particular reference to the Munsell System and the Natural Colour System, the chief representatives of the two types of system, together with some comments on colour naming as an additional method of colour ordering. Here the Kelly‐Judd report on Color: Universal Language and Dictionary of Names (1976) provides a penetrating insight into the subjective terminology by which one block of colour space can be distinguished from another. Some other novel colour order systems are also mentioned.

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