Three Cats with Blue String, c. 1870s Theorem Watercolor in Period FrameI purchased this one from a dealer in upstate NY who had it is his collection for about 30 years. I believe the watercolor is based on a Currier and Ives print, as so many 19th century folk art drawings and paintings were, but rare in my experience to find one rendered as a theorem watercolor. (Theorem paintings were made with the use of hand cut paper or cardboard stencils, lending hard edges to the outlined shapes, and glass tubes used for blowing