Field Equations

Cat hoodies, tees and sweatshirts with a print people stop to ask about. A cat face in glowing rings, a paw print made of dots, a sitting cat drawn in one green line, a cat whose ears grow into a tree of smaller cats: each one a clean, graphic cat printed large on the back of a heavyweight blank, with a small mark at the chest.

The detail that sets them apart is how they are drawn. Every design comes from a single equation rather than a hand, which is why the lines are so even, and each product page tells the short story behind its cat. A good gift for a cat lover who likes their clothes quieter than a cartoon.

Hoodies, a zip-up, crewneck sweatshirts, tees, long sleeves and tank tops, in black, greens, grays, white and apricot. Printed to order, with free standard shipping on orders of US$70 or more and free 30-day returns.
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  • Man seen from behind in the white Nine Lives cat t-shirt in a sunlit room, a cat asleep on the bench beside him.

    Nine Lives Geometric Cat T-Shirt

    Nine Lives Geometric Cat T-Shirt
    $34.00
  • Man sitting on mossy stone steps, seen from behind in the white Epicycles boxy cat t-shirt with a green line-art sitting cat on the back.

    Epicycles Cat Boxy T-Shirt

    Epicycles Cat Boxy T-Shirt
    $46.00
  • Man seen from behind in a Tokyo alley at dusk wearing the black washed cat face t-shirt, a line-art cat face printed on the back.

    Equipotential Cat Face T-Shirt

    Equipotential Cat Face T-Shirt
    $42.00
  • White Territory heavyweight boxy cat t-shirt laid flat on a wooden table, a green mosaic sitting cat printed on the back.

    Territory Voronoi Cat Heavyweight Boxy T-Shirt

    Territory Voronoi Cat Heavyweight Boxy T-Shirt
    $56.00
  • Black mineral wash One Line cat t-shirt laid flat on a linen bed, a green sitting cat in a circle printed on the back.

    One Line Hilbert Cat Mineral Wash T-Shirt

    One Line Hilbert Cat Mineral Wash T-Shirt
    $44.00
  • Black One Line cat long sleeve t-shirt laid flat on concrete, a green sitting cat in a circle printed on the back.

    One Line Hilbert Cat Long Sleeve T-Shirt

    One Line Hilbert Cat Long Sleeve T-Shirt
    $52.00
  • Black Territory boxy cat tank top laid flat on a linen bed, a green mosaic sitting cat printed on the back.

    Territory Voronoi Cat Boxy Tank Top

    Territory Voronoi Cat Boxy Tank Top
    $50.00
  • White Cat Tree heavyweight t-shirt laid flat on a wooden table, a line-art cat head with branching ears printed on the back.

    Cat Tree Fractal Heavyweight T-Shirt

    Cat Tree Fractal Heavyweight T-Shirt
    $38.00
  • Black sunfade One Line cat zip-up hoodie laid flat on concrete, a green sitting cat in a circle printed on the back.

    One Line Hilbert Cat Sunfade Zip-Up Hoodie

    One Line Hilbert Cat Sunfade Zip-Up Hoodie
    $83.00
  • Black sunfade Cat Tree hoodie laid flat on a linen bed, a cat head with branching ears that grow smaller cats printed on the back.

    Cat Tree Fractal Sunfade Hoodie

    Cat Tree Fractal Sunfade Hoodie
    $83.00
  • Woman in the oat gray paw print sweatshirt relaxing in a wicker chair with an orange tabby cat on her lap.

    Phyllotaxis Paw Print Sweatshirt

    Phyllotaxis Paw Print Sweatshirt
    $56.00
  • Man seen from behind on a misty forest ridge wearing the black Nine Lives cat hoodie, a geometric line-art cat printed large on the back.

    Nine Lives Geometric Cat Hoodie

    Nine Lives Geometric Cat Hoodie
    $63.00
  • Black Territory boxy cat hoodie laid flat on a stone floor, a green mosaic sitting cat printed on the back.

    Territory Voronoi Cat Boxy Hoodie

    Territory Voronoi Cat Boxy Hoodie
    $77.00
  • Oat gray Cat Tree crewneck sweatshirt laid flat on a wooden floor, a line-art cat head with branching ears printed on the back.

    Cat Tree Fractal Crewneck Sweatshirt

    Cat Tree Fractal Crewneck Sweatshirt
    $62.00
  • Oat gray paw print hoodie laid flat on a bed, a large green cat paw made of spiraling dots across the front.

    Phyllotaxis Paw Print Hoodie

    Phyllotaxis Paw Print Hoodie
    $57.00
  • Gray Nine Lives boxy cat tank top laid flat on a wooden table, a geometric line-art cat printed on the back.

    Nine Lives Geometric Cat Boxy Tank Top

    Nine Lives Geometric Cat Boxy Tank Top
    $50.00
  • Woman in a beanie seen from behind on a balcony above a misty forest, wearing the black cat face long sleeve shirt.

    Equipotential Cat Face Long Sleeve T-Shirt

    Equipotential Cat Face Long Sleeve T-Shirt
    $52.00
  • Black oversized cat face hoodie laid flat on a stone floor, a line-art cat face with whiskers printed on the back.

    Equipotential Cat Face Oversized Hoodie

    Equipotential Cat Face Oversized Hoodie
    $63.00
  • Black Epicycles cat crewneck sweatshirt laid flat on a linen bed, a green line-art sitting cat printed on the back.

    Epicycles Cat Crewneck Sweatshirt

    Epicycles Cat Crewneck Sweatshirt
    $62.00