Some recent instances of culture jamming in Galway City
The purpose of this kind of art is to make people on the street think about our world and how they're living in it.
It's also reclaiming mental space - in our consumer culture we are constantly bombarded with materialist advertising, so this is one way we have of countering such messages (with our budgets being considerably less than those of the multinationals).
Some of the stencils are originals, some were taken from internet galleries (see link below).