Relations among percepts in the organized perceptual world are called percept—percept couplings. If these couplings are assigned a causal interpretation they present a challenge to a theory of direct perception. Experimental evidence of percept-percept coupling is reviewed and the case for a causal interpretation of these relations is examined. It is concluded that the causal interpretation is plausible and that the facts of percept—percept couplings need to be addressed by advocates of a theory of direct perception.