In "The Origins of Geometry", Michel Serres sees Thales' conception of a model as uniting scale, module, and light to establish a 'rational and universal approach'. Thales uses the gnomon (a simple geometrical tool, like a shadow-casting stick) to measure and abstract relationships across scales, such as linking the height of a pyramid to its shadow. This process introduces the concept of a module (the gnomon operates in terms of modules), a replicable unit and a building block that can bridge observation and theory. Thales creates a model that connects local phenomena to universal principles, laying the foundation for algorithmic reasoning. Here, the notion of “scales” relates to models that “realize,” not models that “represent.” As such, they are distinctive from the scale of Euclidean space and relate more to a notation-related understanding of scale like musical scales, or the measuring of spectrality in information technics and quantum physics. Building on this, I propose an analogy between the module as described above and the stone, where the stone becomes a figure of thought to approximate the gnomon-modularity domain. Just as the module mediates between observation and theory to enable abstract reasoning, the stone—in its geologic, mythical, and architectonic dimensions—operates as a conceptual and material module. In this respect, Italo Calvino's geologic-mythical works, where the sky turns into stone, inverting inside and outside; Paul Celan's mineral poems, where the stone embodies a spiritual principle; Isamu Noguchi's sculptures, where the stone is sculpted into elemental forms; and Smiljan Radic's architecture, where the stone’s exuberance suggests scalar resonance, will be presented as a constellation, opening, as such, a room for the scalarities of stone as a figure of thought. In architecture, such a notion of the model is arguably at work: one that is simultaneously metaphysical, scientific, technical, and cosmical. From this perspective, the stone-as-module becomes an artistic hypothesis with the capacity of fostering both precision in understanding and intersubjectivity in practice.