Span Bloom

r = cos(kθ) · a = r cos θ · b = r sin θ
p(θ) = center + a·v + b·w

Every bloom is the recorded path of a point in span v w.
focus θ 0.00 a 1.00 b 0.00 p = center + 1.00v + 0.00w

Every stroke is previous p → current p. No petals are drawn; each bloom is accumulated vector addition.