Equipotential Cat Face T-Shirt

A cat face t-shirt and a gift for cat lovers who love science: a glowing line-art cat face on the back of a washed, oversized cotton tee, in black, dark green or pirate gray.

Two charges, one cat.

Put two equal charges side by side and draw every line where the field is the same strength. Close in, the lines ring each charge separately; far out, they merge into one smooth oval; exactly between, they cross in a figure-eight. Those two charges became the eyes. The figure-eight became the bridge of the nose. The field lines that stream away from them became whiskers.

The design

Rust rings around each eye, a single cream lemniscate between them, and sage and forest-green ovals widening out to the edge of the face. Nekomori wordmark and Field Equations / No.05 Equipotential above; 猫森 and |z − a|·|z + a| = c below. A small version on the left chest.

The fit

Oversized with a dropped shoulder. The snow wash softens the cotton and gives each shirt a slightly different, lived-in surface.

The blank

• 100% cotton, 250 g/m² (7.4 oz), snow washed
• Oversized cut, dropped shoulder
• Sizes S–3XL
• Printed with DTF (direct-to-film) transfer

Giving it as a gift

A science-themed cat gift for the physics student, teacher or engineer with a cat at home. The face is drawn from the equipotential lines around two charges, the snow wash makes every shirt a little different, and it looks just as good on someone who simply loves cats.

• Sizing for someone else: It's oversized with a dropped shoulder, so their usual size gives the relaxed fit shown. Sizes S–3XL. If it doesn't fit, it can come back within 30 days of delivery, unworn, with free return shipping.
• Ordering for Christmas or a birthday: every piece is printed after it is ordered, so count back about three weeks and order before then. The dated delivery estimate under the buy button is the one to go by, and checkout offers express shipping on most garments if you are cutting it close.

Buying for more than one cat person? Our guide to gifts for cat lovers that they'll actually wear has more ideas, and how to get a size right without asking.

Color, Pattern & Material

• Color: Snow-washed Black, Dark Green or Pirate Gray, with cream, sage, forest-green and rust artwork.
• Pattern: Cat face built from Cassini-oval equipotential lines, with field-line whiskers, on the back; small matching print on the left chest.
• Material: 100% snow-washed cotton, 250 gsm.

Washed garments vary slightly from piece to piece; that is the process, not a fault.

Field Equations is Nekomori's series of cats drawn by mathematics instead of by hand: each design is a single equation, rendered, then left alone.

Printed for your order — nothing is held in stock. Artwork original to Nekomori, generated from the equation printed beneath it.

Care

• Machine wash at 30°C / 86°F, gentle cycle, inside out
• Do not bleach
• Tumble dry low
• Iron at low temperature, never directly on the print
• Do not dry clean

Size guide

Garment measured flat. Chest is the width across the body, armpit to armpit.