The pregnant man visual (top right) was part of an Health Education Council to reduce unwanted pregnancies. The headline ran “Would you be more careful if it was you that got pregnant?” Copywriter Jeremy Sinclair, (Saatchi’s). By exploiting the symmetry of an imaginary situation, there’s an unarguable case for being more careful with contraception.
Below, bottom left, mushroom as jet engine. This visual idea was used both by British Airways to sell its food services, and also by HSBC to discuss organic fuel sources in the future. The BA idea ran “Before we fuel the aircraft, we fuel the passenger”. The HSBC campaign creatively recycled it, with the line “In future, we will all fly organic.” Anyway, the point is that strong ideas discover and exploit meaningful symmetry. See conceptual symmetries and Darwin
See also Ideas