Upside Down Calculator One Piece by katyANDzucchini. We love this line from indie screenprinter katyANDzucchini! Derived from science and wit, these shirts offer simple yet intellectually satisfying designs on 100% cotton one pieces. The garments are manufactured overseas and then each design is hand screen-printed with love using earth-friendly methods right here in the USA! These are hand-dipped in a sweet turquoise blue dye.