Which property of form describes how big or small an object is?

The property of form that describes how big or small an object is, is size. Size refers to the dimensions or magnitude of an object, which can be understood in terms of its height, width, depth, or volume. In architectural terms, size is essential because it influences how a space is perceived and how it interacts with human scale. It determines the relationship between various components of a design, affecting functionality, aesthetics, and the overall impact of the structure.

The other properties mentioned in the options serve different purposes, such as color, which deals with the visual perception and psychological impact; texture, which refers to the surface quality and tactile experience; and position, which is about the location or arrangement of an object within a space. While all of these properties contribute to the overall perception and experience of an object or space, size specifically addresses its physical dimensions.