（1） （ru^pa）: 'form.' 1） That which changes and decays， has the quality of shape and mutual obstruction. The Sanskrit root of the word ru^pa， rup， is a verb which means to have form， therefore the primary meaning of 'something which has form.' It is understood as something created by forming （Skt. ru^pyata iti ru^pam）. It also has the meaning of the verbal root ru， meaning decay， or break down， and therefore， something which decays or breaks down， or changes. It is a word which refers to a material object which has shape， is formed or created， and changes. It is understood with the meaning of zhiai 质碍 "materially obstructing，" and bianhuai 变坏， "changing and decaying，" both of which are the nature of all that possesses form. Other technical usages of the term include the meanings of （1） color， colorful （Skt. varna， citra， ranga）; （2） color and form; that is， as an object of the eye consciousness. That which can be seen by the eye. All material existence， possessing form. The objects of the faculties of perception， so not simply color， but color and form together. Objects of vision; one of the five object-fields. Also called sechen 色尘 the 'data-field of form，' which is one of the 'six data-fields' or six objects of consciousness. Also has the meaning of 'form realm' （色界）. In the Abhidharmako/sa school， 色 is also interpreted as 显色， that is， visible color as opposed to 形 （xing） which means visible shape. （3） In the doctrine of the Yogacara school 瑜伽行派， one of the five categories of elements within the group of form elements （色法）. When considered as one of the five object realms （五境）， it is the object-realm of the faculty of sight.