Visual Guide: The Canvas of Outer Experience (§2)

$$ \text{Physical Reality} \quad = \quad \underbrace{\quad \text{Space} \quad}_{\substack{\textit{a priori} \ \text{Form of Outer Sense}}} \quad \times \quad \underbrace{\quad \text{Sensation} \quad}_{\substack{\textit{a posteriori} \ \text{Matter}}} $$