Polígonos

[Indonesia 1997; Malaysia 1970; Malta 1968; Monaco 1955; Netherlands 1993; Pakistan 1976; Pitcairn Islands 1999; Thessaly 1898]

Passatempos matemáticos

[Hungary 1982; Monaco 1976; Netherlands 1973; Sweden 1985]

Arte Computacional e gráficos

In recent years computer-aided design has also developed rapidly, and in 1970 the Netherlands produced the first set of computer-generated stamp designs. The stamps show an isometric projection in which the circles at the centres of the faces gradually expand and become transformed into squares; the black-and-white design was called overlapping scales.
The computer drawing of a head is a graphic from the 1981 computer-animated film Dilemma, and the United States stamp came from a set celebrating the new millennium.  
[Hungary 1988; Netherlands 1970; USA 2000]

O século XX

[China 1999; Czech Republic 1993; Greece 1994; Netherlands 2007; Poland 1982]

A natureza da luz

[Germany 1979, 1994; Netherlands 1929; Nicaragua 1971; Portugal 1974; San Marino 1991; Sweden 1978]

Os países baixos

[Belgium 1942; Comoro Islands 1979; Netherlands 1929, 1947, 1962]

Instrumentos de navegação

[Austria 1966; British Virgin Islands 1997; Netherlands 1986; Portugal 1993; St Christopher, Nevis and Anguilla 1970]