Equipotential Cat Face Long Sleeve T-Shirt

A cat long sleeve shirt and a gift for cat lovers into physics: a line-art cat face and whiskers drawn from equipotential lines, printed large on the back of an oversized 305 gsm cotton long sleeve in black.

Two charges, one cat — with sleeves.

Every line in this face is a line of equal strength around two equal charges. Near them the lines circle each one on its own; further out they merge into a single oval. The charges are the eyes, the figure-eight where the two families meet is the nose, and the field lines leaving the face are the whiskers. It is the same drawing as No.05 on the tee, cut for colder days.

The design

Rust rings around each eye, a single 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 and a long, relaxed sleeve. A 305 gsm, 100% cotton jersey that layers well under an open jacket.

The blank

• 100% cotton, 305 g/m² (9.0 oz)
• Loose, oversized cut with dropped shoulder
• Sizes XS–XL
• Printed with DTF (direct-to-film) transfer

Giving it as a gift

A gift for the science teacher or physics fan who has a cat, and for anyone who wants a cat shirt that works under an open jacket from fall into spring. Heavy cotton, an easy black, and a print that rewards a second look.

• Sizing for someone else: It's oversized with a long, relaxed sleeve, so their usual size gives the intended slouch. Sizes XS–XL. 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: Black, 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% cotton jersey, 305 gsm.

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.