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This chapter reports an experiment on a spatial descriptions task, originally designed by Ehrlich and Johnson–Laird to study the integration of sentences in a comprehensive representation. Items in the original studies all comprised three sentences, describing the positions of four objects. The chapter concluded that subjects integrated the spatial descriptions in the form of a “spatial mental model”, rather than a network of propositions. A spatial mental model is an analogue representation, consisting of a finite set of tokens and a finite set of spatial relations between them. The relations are represented by mentally locating the tokens within a dimensional space. One might suggest that young children are unable to construct spatial mental models. This suggestion is ruled out, however, by research on a task involving the planning of a drawing. This research showed that children aged 6 to 11 can …