Braille and plough: what they have in common

1. Step 1. Braille — works like — Binary number system. Six dots — a six-bit code.
2. Step 2. Binary number system — evolved from — Hindu–Arabic numerals. A positional system with base 2.
3. Step 3. Hindu–Arabic numerals — works like — Abacus. Positional counting with beads.
4. Step 4. Abacus — is made of — Stone. Counting was done with pebbles — the Latin calculus.
5. Step 5. Stone — is material for — Hoe. The working part was of stone or antler.
6. Step 6. Hoe — evolved into — Plough. The plough mechanized loosening the soil with a hoe.

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