 This logo has been modified from two dimensions, to colour, to three dimensions, over time and it is now one of the most well-known logos in Australia.Due to the start of colour test transmissions, ABC TV's logo was modified to a thickened variant on 19 October 1974 and it was also changed to a crossover design.To celebrate the Australian Bicentenary, on Australia Day in 1988, the ID's were updated.