Periodex is a radial visualization that maps the power-of-two rhythmic subdivisions of a 4/4 time signature, generated by a variant of the Algae L-System that expands a starting symbol through twelve iterations. The visualization displays the resulting pattern as a series of black arcs radiating from the center, with each ring representing a successive iteration, where the presence of an arc indicates a note onset. The code uses React to render the SVG, d3.scaleBand to map iteration indices and symbol positions to polar coordinates, d3.arc for arc geometry, and d3.range to build the iteration sequence for the L-System's production rules.