Full Idea
Shape can be directly experienced by either touch or sight, which are subjectively different; but colour and sound can be directly experienced only through experiences which are subjectively like sight and hearing.
Gist of Idea
Shape can be experienced in different ways, but colour and sound only one way
Source
Howard Robinson (Perception [1994], III.1)
Book Reference
Robinson,Howard: 'Perception' [Routledge 2001], p.68
A Reaction
This seems to be a key argument in support of the distinction between primary and secondary qualities. It seems to me that the distinction may be challenged and questioned, but to deny it completely (as Berkeley and Hume do) is absurd.