The fact that these paintings are possibly the oldest in the residential complex makes them a document of particular value—a window into Tetitla's first phase of occupation, prior to the major mural programs that now define the site's visual identity. Their limited palette—two shades of red, yellow, and white—and schematic geometry contrast with the polychrome sophistication of the later murals, offering a glimpse of how the complex's pictorial program evolved over time. The double-trapezoid finial crowning the rectangles is not an arbitrary form: it is the year sign in Teotihuacan iconography, the emblem of time that appears as a merlon on dozens of buildings across the site and as a decorative motif on ceramics and ritual objects.