@MissouriMan,
There are several web sites about the artist mentioned by Boomerang, and I believe he is the correct one, even though yours is very geometrical and his work, at least now, is more figurative. These are common changes that many artists make, i. e., Braque, Picasso,etc. As to your observation that the surface appears to be varied, that Can be a clue to Authentic/Original but not completely. Today many reproduction prints are made with obvious "brush strokes" and even varying thickness; sometimes an artist or company takes a mechanical print and actually emphasizes some of the colors or lines by painting Over it. In that case, you would see and, maybe, feel what would lead you to believe that you had an Authentic/Original work. I suggest that you get a magnifying glass and look for the squared, dot patterns of a lithograph machine; if there, you have a repro or an cheaply made mechanical litho. To be further confusing, even these are sometimes numbered and signed, usually in very large, and invaluable, editions. if no dots, then use the glass to see if the painted/raised variations are random or repeating patterns all over the work---another sign of COPY! A Real piece should have different, random layers & levels of paint stokes,etc. Good Luck!