Rule 90 Cellular Automaton

Rule 90: next[i] = prev[i−1] XOR prev[i+1]

000→0, 001→1, 010→0, 011→1
100→1, 101→0, 110→1, 111→0

Binary: 01011010 = 90

Self-similarity → Sierpiński triangle (Pascal's triangle mod 2)
Rule 90 CA · additive (XOR) · fractal dimension = log(3)/log(2) ≈ 1.585
Generation: 0