Sculpture 'Frozen Inflorescence', in the exhibition 'Schaal en Maat' (Scale and Size), 2001 in Tytsjerk, The Netherlands. Diameter 4.5m; 50 pieces of steel form a phyllotactic pattern on a flat plane. Each of the units was fixed by a screw through a little hole in the center.

(below right) The artwork as a phyllotactic puzzle.

(photo top right by Erik Hesmerg, Sprezzatura)