---
title: "Abacus"
url: "https://sanyam.sh/lab/abacus"
date: "2026-10-07"
---

# Abacus

Move along the rod to count the beads.

an abacus drawn in single strokes: where the pointer sits along the rod splits the ten beads, the ones to its left packed against the left post and counted, the rest against the right.

key insight: one pointer position always gives one arrangement, since the split is read against the rod, which never moves, and never against a bead. the beads cannot pass each other, so the bead at the front of each moving group leaves first.

built on the `hairline` engine by [lucas markes](https://hairline.lucasmarkes.com/).

- Reference: https://hairline.lucasmarkes.com/
- Source: https://github.com/SanyamPunia/www/blob/main/components/labs/abacus/figure.ts