# David Zelenka

Since producing a pattern generator tool in 2005, David has used it
for designing and artistic inspiration. The equation used, x= t*sin
(t) - r*cos (t), y= t*cos (t) + r*sin (t), is particularly generous
with its designs: stars, waves, texture, leaves, mandalas, and of
course, spirals. The resulting interference patterns produce
phyllotaxis spirals and structures exhibiting a close relationship
to Fibonacci's sequence. The pattern generator has been freely
available online for many years allowing other artists to use the
patterns for their work.