posted in: Medium | 0


This series of fish lithographs was made while I was living in the Darlinghurst neighborhood of Sydney Australia – inspired by trips to the Sydney Fish Market.


Joan Martin, ‘Bonito’, lithograph 14″ x 23″

Each trip to the market provided one unique fish that was the model during one drawing session using grease-based pencils and ink on a metal lithography plate.


Joan Martin, ‘Aussie 1’, lithograph 14″ x 23″

I drew on metal lithography plates instead of traditional heavy limestone.  Ease of portability made plates appropriate for the spontaneous approach.


Joan Martin, ‘Aussie 2’, lithograph 14″ x 23″

I was fortunate to have access to a robust but ancient lithography press. The litho plate was sensitized to accept ink in areas drawn with grease-based materials and repel ink in areas with no drawing. Ink was rolled onto the water moistened plate and paper placed on top. Plate and paper were cranked through the press causing the extreme pressure of the press roller to force the ink onto the paper. The printing process was repeated to create an edition of 10 lithographs.


Color Blindness

posted in: Visible Spectrum | 0


The multi-coned eyes of the Mantis Shrimp captured our imaginations
Photo Courtesy: National Science Foundation

The famous eyes and red/green coloring of the Mantis Shrimp made me curious about the color spectrum the shrimp sees – – – and also curious about the colors a human with red/green blindness sees when looking at the image of the red/green Mantis Shrimp. The shrimp’s eye has four times as many cones as the human eye’s three. Yet the possibility of the shrimp’s color vision surpassing that of a human fades into myth.

Swept away by controversy and mind-bending research and myth, my attention shifted to research on the complex ability of cells in the Mantis Shrimp eye to process polarized light. The shrimp’s eye has become inspiration for breakthroughs in optical technology. Somewhat satisfied, I move on to the more easily defined color spectrum seen by humans with red/green color blindness compared to humans without color blindness.



Color spectrum as seen by human eye with normal vision


Color spectrum as seen by human eye with red/green color blindness (Deuteranopia)



Red & bitter lime. Left: with red/green color blindness. Right: with normal vision.

Once I rendered these approximations in Photoshop, I was stunned to see the difference – not just color wise but also spatially.  Can this be true?  If you have red/green color blindness the above two images might look similar. Apparently 10% of the population has some degree of red/green color blindness.



The Mantis Shrimp as seen by a person with red/green color blindness
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