Maria Fernanda Cardoso has spent her life observing tiny things that most people don’t notice. Her new 335 square metre mural unveiled last week in Castlereagh Street however is anything but tiny and is the largest by an Australian artist in Sydney’s CBD. The 11 storey high mural 'tattooed' down the side of award-winning architect Angelo Candalepas's new Castle Residences features magnified images of microscopic water droplets.