pteranodon -- painted steel -- the measurements of the tubing were based on photographs of fossil bones

pteranodon -- painted steel -- about 2/3 life size

coatrack -- mahogany

coatrack -- mahogany

archimedes hat -- wool -- knitting pattern based on the archimedean spherical spiral -- pattern may be viewed online at:
http://www.ravelry.com/dls/ouroboros/24860?filename=Archimedes.pdf