A collection of predicates that relate objects to a sensory attribute. This category is distinguished from PhysicalAttributeDescriptionSlot because instances of this spec describe relations which implicitly assume a perceiver, i.e., things have sensory attributes in virtue of being perceived and the nature of the attribute is somewhat perceiver dependent and even dependent upon the perceptual conditions. Sensory attributes are perceiver dependent in a way that other physical attributes are not. Locke's distinction between secondary and primary qualities is relevant to the distinction alluded to here.