Full Idea
The private object or sense datum view is an instance of the false objectification of what is essentially subjective.
Clarification
A 'sense datum' is an sensation, thought of as existing between an object and the experience of it
Gist of Idea
Sense-data are a false objectification of what is essentially subjective
Source
Thomas Nagel (Subjective and Objective [1979], p.207)
Book Reference
Nagel,Thomas: 'Mortal Questions' [CUP 1981], p.207