Three examples of stamp sets commemorating the1972 Olympic games: an Australian set produced for the summer games at Munich; one from the USA for the same games; and a German set publicising the subsequent winter games at Sapporo in Japan.The pictogram used on the USA stamp is part of Otl Aicher's famous set, but I don't recognise the ones used on the Australian stamps. They appear to be half-way between the 1964 Tokyo pictograms and Aicher's work, but I don't have information about the designers of any of these sets, and would be glad to find out if anybody does know.
