Representational systems need to use symbols as internal stand-ins
for distal quantities and events. Barsalou's ideas go a long way
towards making the symbol system theory of representation more
appealing, by delegating one critical part of the representational
burden – dealing with the constituents of compound structures
– to image-like entities. The target article, however, leaves
the other critical component of any symbol system theory –
the compositional ability to bind the constituents together –
underspecified. We point out that the binding problem can be alleviated
if a perceptual symbol system is made to rely on image-like entities not
only for grounding the constituent symbols, but also for composing these
into structures.