 "Sea" from 1959, in the collection of the Honolulu Museum of Art, is an example of these almost abstract seascapes.During his lifetime Oliveira made notable works in a huge range of media, including oil paintings, acrylic paintings on paper, drawings in ink, charcoal and pencil, lithographs, etchings, posters, and sculptures in clay, wax and bronze.Oliveira was especially noted for his work in the monotype medium, in which single printed impressions are made from a painting executed on a metal plate.