The current theme is search: Golden Rectangles which led to finding them in search: St Peter’s Basilica in Rome and in the Umayyid Mosque in Damascus. But the Olmec heads have come to mind after a TV documentary, so that work from 2017 was completed, suggesting “what they mean”.
I have started a theme on Music, part one giving overview of how music derived originally from an ancient world where pure number relationships between tones (ratios) developed much the familiar terminology of modern music, but in the interests of group performance and composition, each interval sacrifices purity for utility.
I have also republished an article on the significence of square roots.