During the 1970s, Marquis moved further into murrine, which he explored in one of his favorite forms: the teapot. He continued to improvise on the teapot form in glass throughout his career. Marquis made teapots inspired by traditional American crazy quilts, by checkerboards, and by Venetian pezzato or patchwork vases of the 1950s. Although Marquis uses traditional Venetian decorative techniques, his work in glass is never mistaken for Venetian. His approach is a distinctively American interpretation, which distinguishes his glass from that of many artists who work in the Italian style today.