Full Idea
Contextualist about knowledge say that "to know" means different things in different context. For example, a warehouse may be empty for a furniture owner, but not for a bacteriologist or a physicist.
Gist of Idea
Contextualism says that knowledge is relative to its context; 'empty' depends on your interests
Source
Paul O'Grady (Relativism [2002], Ch.4)
Book Reference
O'Grady,Paul: 'Relativism' [Acumen 2002], p.105
A Reaction
There is obviously some truth in this, but we might say that 'empty' is a secondary quality, or that 'empty for furniture' is not relative. We needn't accept relativism here.