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This collection (so far) consists of three pieces, each of which features a different cat silhouette. 

Two of the pieces are counterchange patterns in black-and-white. A counterchange is a two-color checker pattern in which a dark motif on a light ground alternates with a light motif on a dark ground, the motif in this case being a cat silhouette. While these pieces can be made in many different color combinations, the black-and-white (or “tuxedo” for all you cat people out there and, let’s face it, if you weren’t a cat person you wouldn’t even be reading this) is Julia’s personal favorite.

The third piece is a many-colored piece called “Rainbows Are Made of Cats” because, as we all know, it has been scientifically proven beyond a shadow of a doubt that rainbows are indeed made of cats.

For every Cat Collection artwork purchased, Cartesian Graphics will donate $50.00 to the Mayor’s Alliance for NYC’s Animals. Since its founding in 2003, the Alliance has been committed to transforming New York City into a community where no cat or dog of reasonable health and temperament will be killed merely because he or she does not have a home. The Alliance is a non-profit charity that works with a coalition of 150+ rescue groups and shelters throughout the five boroughs to achieve this goal. While the Alliance works collaboratively with the City of New York, it is not a city agency and does not receive any government funding, so your donations are very much needed and greatly appreciated. If you would like to learn learn more about the Alliance, visit their website at

November 2018. Pussellation designs are added to the Cats Collection.

The Pussellation designs are, quite simply, tessellations of cats. A tessellation is the covering of a flat surface using one or more geometric shapes, called tiles, with no overlaps or gaps. The geometric shape in this case is a cat silhouette. The mathematics of tessellations is actually quite complex and irrelevant in this context, so no more math.

Tessellations are common in art and architecture, and can be found dating back to classical antiquity. Roman mosaics were frequently composed of tessellations, and the decorative tiling of Islamic architecture made use of the tessellation in buildings such as the Alhambra Palace in Spain. More recently, the artist M.C. Escher used the tessellation to create his fantastical images.

The first Pussellation design was created in black-and-white, in continuity with the earlier black-and-white Cat Collection pieces based on cat silhouettes. However, as Julia started experimenting with color, the pieces sorted themselves into two sub-collections, each consisting of three pieces: the Pussellation group in black, white, and gray and the Pink Pussellation group in shades of pink. Julia sees the neutral Pussellation pieces as tiles that can be combined to form larger patterns much like quilt blocks, an arrangement she thinks of as the Pussellation Patchwork. The three shades of pink in the Pink Pussellation group can be arranged linearly from dark to light creating an ombre pattern which Julia calls the Pussellation Gradation.

Finally, as Julia was working on the Pink Pussellation designs, she was struck by their resemblance to the pussyhats worn during the Women’s Marches of January 21, 2017. As such, Cartesian Graphics will donate $50.00 to Planned Parenthood for each Pink Pussellation artwork purchased.