Phi shows up in shells, sunflower seeds, and about four hundred design articles that overstate the case. The spiral is still beautiful and the math is still real, which is enough. Vintage math print for the person who runs the numbers before agreeing with the poster.
Soft ringspun cotton, unisex fit, true to size. Go up one if you like a little extra room through the body. Comes in Athletic Heather, Ash, Natural and White.
Printed after you order, which is why nothing sits in a warehouse. Out the door in 3 to 5 business days. The DTG ink soaks in and stays soft through the wash. Wash cold, inside out, tumble dry low.
