Suggestion: to make the tree self-similar at the vertex point, use [x, y] = t * [cos, sin] ( k * ln(t) ). The constant k determines the tightness of the spiral

Suggestion: to make the tree self-similar at the vertex point, use [x, y] = t * [cos, sin] ( k * ln(t) ). The constant k determines the tightness of the spiral winding. Another way to describe it: the spiral's uphill slope stays constant.