Thanks, Roger. And thanks for the tip. Good to know my movement has historical precedence. I'll have to seek out more of his work for comparison to some of the things I've been doing.
nice work James.. also have a look at David Potts work from the early 1950's... http://www.joseflebovicgallery.com/Catalogue/CL_142_2010/Graphics/CL142_DavidPottsColourWork.pdf