A systematic examination of how the fundamental scientific concepts of space and time arise from the simplest generalizations of perceptual experience. The text traces the roles of mathematics and measurement in shaping physical geometry, distinguishing abstract axiomatic systems from geometry rooted in empirical observation. Developments in contemporary physics, including the theory of relativity, are assessed for their implications while avoiding commitment to specific laws. Philosophical questions about the object of perceptual knowledge are separated from metaphysical accounts of the knower, and methodological puzzles are identified to guide further inquiry.