No dia do Pi

Mosaico de Apolo (MNA, Lisboa)

- 

Ende, Heaven - Beatus de Gerona (c. 975)

-

Mosaico cerâmico (1501-1550, MNAz, Lisboa)

-

Andrea della Robbia, Virgem com o Menino e São João Baptista (1501-1520, MNAA, Lisboa)

-

Cúpula da Basílica do Palácio Nacional de Mafra (1735 © Sipa 1965)

 -

August Macke, Colour circle

-

Kazimir Malevich, Black circle (1923)

-

Ellsworth Kelly, Circle line (1951)

-

 

Marcelle Cahn, Composition with circles

- 

M. C. Escher, Circle Limit III (1959)

-

David Annesley, Big yellow circle (1966)

-

De Wain Valentine, Circle, blue rose (1977)

 

 

 

Violeta(s)

Albrecht Durer, Violet Bouquet

-

Édouard Manet, Bouquet of violets (1872)

-

Anna Eliza Hardy, Still Life of Violets

-

Heinrich Kuhn, Violets (1908)

-

Ferdinand Georg Waldmüller, The violet girl 

-

John Singer Sargent, Violet (1886)

-

Cuno Amiet, The violet hat (1917)

-

Janos Tornyai, Winter landscape with violet lights
-

Eyvind Earle, Violet tree and barn (1975)

-

Max Bill, Blau-violettes horizontal-vertikal-quadrat (1968)

-

De Wain Valentine, Circle violet to black (1971)

-

Ametista