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flickering skins of the "head foot"
chromatophores » http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/C/Chromatophores.html
polymer based
other cephlapods include a range of octopuses (or 'octopi' for those who conflabulate grekolatiniun) and the Magnapinna Pacifica
cephbase » http://www.cephbase.utmb.edu/