elder-plinius/enthea

ENTHEA is a visual synthesizer that generates psychedelic, mathematically-driven animations in your browser. The entire program is a single HTML file, requires no installation, and has no external dependencies. You open it in a modern browser and it runs immediately. The visuals are not pre-made videos or looping textures. They are computed live using mathematics drawn from neuroscience research into how the brain produces hallucinations. The program simulates patterns that arise when the visual cortex enters certain states, then maps those patterns through the same geometric transform the brain uses to process what the eyes see. The result is the same family of shapes that appear in psychedelic experiences, migraine auras, and near-death states: tunnels, spirals, lattices, and cobwebs. There are 29 distinct visual modes grouped into categories including cortical simulation, reaction-diffusion systems, wave interference patterns, fractal geometry, and more. Any mode can be filtered through one of 17 mathematical symmetry groups, turning it into a repeating tile pattern. The program also includes a drop-detection system for music: when you load an audio file, it analyzes the full waveform in advance and triggers visual effects on beats and drops, firing one of nine distinct transition effects each time. Sound can be fed in from a microphone, a local audio file, or audio from another browser tab. The program also includes a MIDI controller input for live performance, scene snapshot saving, and a binaural tone generator. Fourteen substance profiles each load a visual signature and a timed arc from onset to peak, built from published phenomenology research. The target users span VJs running live shows, musicians wanting visuals for their tracks, educators teaching neuroscience, and anyone curious to explore the underlying mathematics. The README links to further documentation in a SCIENCE.md file and cites the peer-reviewed research the math is based on.