Her major public commissions included: The Man Who Sang and The Woman Who Kept Silent aka The Blue Dress at the Constitutional Court in Johannesburg, South Africa. Several large tapestries in collaboration with Marguerite Stephens and stained-glass window designs for the Great Park Synagogue in Johannesburg. In 2008, from 2 October to 6 December 2008, the Standard Bank Gallery in Johannesburg, South Africa hosted a major retrospective of paintings, drawings, assemblage, installations, artists books and essays. Sasol Art Museum at the University of Stellenbosch installed the same retrospective titled: A Prospect of Icons from 14 January to 28 March 2009. Her first solo exhibition was at Gallery 101, Johannesburg, in 1964 after winning second prize in the U.A.T competition in 1963. Mason has exhibited regularly in Johannesburg, Cape Town, Pretoria, Stellenbosch, Mpumalanga and George. Goodman Gallery, Chelsea Gallery, Association of Arts Pretoria, Association of Arts Cape Town, Hout Street Gallery, Strydom Gallery, Dorp Street Gallery, Art on Paper, Abalone Gallery, Sasol Art Museum, University of Stellenbosch, Standard Bank Museum, Karen Mackerron Gallery, as well as lithographs, oil paintings and drawings at Ombondi Gallery in New York in 1990 and more recently, tapestries, paintings and drawings at the Deering Estate, Miami Dade, 2016 and lithographs at Art Basel Miami Beach 2010 and 2015. She represented South Africa at the Venice Biennale, 1986, São Paulo Biennale 1973, Brazil, Valparaiso Biennale 1979, Chile and Houston Arts Festival 1980, USA.
