Sentence:  It takes a great deal of abstraction to free oneself from the primitive impression of larger unities of power and influence and to view one 's world simply as a <WSD>collection</WSD> of sense data arranged in such and such sequence and pattern , devoid of all power to move the feelings and actions except in so far as they present themselves for inspection . 
Meaning of the word marked with <WSD> tags:  several things grouped together or considered as a whole