Full Idea
Direct realism is unlikely to be able to provide an explanation of perceptual error without collapsing into indirect realism.
Clarification
'Indirect realism' also known as 'representative realism'
Gist of Idea
Maybe we are forced from direct into indirect realism by the need to explain perceptual error
Source
Jonathan Dancy (Intro to Contemporary Epistemology [1985], 10.3)
Book Reference
Dancy,Jonathan: 'Introduction to Contemporary Epistemology' [Blackwell 1985], p.151
A Reaction
If there is an error, there must be two things which don't match: the perception, and the reality. This seems to me a powerful reason for preferring indirect or representative realism. I like the idea that we make mental 'models' (rather than inferences).