Frost Arc

Frost Arc is a visual polyrhythm studio built on the mathematics of Euclidean rhythm. Stack up to five concentric rings, each distributing beats evenly across its own step grid using the real Bjorklund algorithm. A single shared clock sweeps all rings simultaneously — and wherever two or more rings strike the same step, a gold frost arc bursts into view. That moment of rhythmic convergence is the heart of the experience. The Weave Studio lets you sculpt compositions in real time. Adjust the onset count and step count per ring, rotate individual rings to shift their offset, and dial in tempo from 40 to 240 BPM. Flip between Ring, Wheel, and Ladder views to study your pattern from every angle. The Coincidence Lab pairs a radial analysis wheel — where arc size reflects strike density — with a statistics strip showing cycle length, total onsets, coincidence count, and rhythmic density. Tap any segment to see exactly which rings collide at that global step. Frost Arc ships with 15 named world rhythms drawn from Toussaint's 2005 ethnomusicology survey: Cuban tresillo and cinquillo, Brazilian bossa nova and samba, Bulgarian ruchenitza, Turkish aksak and nawakhat, West African Ashanti bell, South African Venda clapping, Central African Aka frame drum, and authentic multi-ring layerings that reveal how ancient groove traditions reduce to elegant mathematical patterns. The interactive Guide teaches Euclidean distribution from scratch with live steppers and a visual grid that respond as you explore. Build new compositions from scratch in the Weave Composer, save them to your personal library, and return to them any time. Everything runs fully offline — no account required, no audio, no network dependency. Just pure rhythm, mathematics, and light.