Daisy

A daisy is a figure resembling a daisy or sunflower in which copies of a geometric figure of increasing size are placed at regular intervals along a spiral. The resulting figure appears to have multiple spirals spreading out from the center. A Vogel spiral instead distributes points with nearly uniform density using a different radial law, producing another flower-like pattern used to model phyllotaxis.

The logo chosen for the 2006 International Congress of Mathematicians shows a striking similarity to the left figure above.