Dots were used to hide secret information: Dot painting in the main, began when the Aboriginal people became concerned that white man would be able to see and understand their sacred and private knowledge. The dots (sometimes called 'over-dotting') were used to obscure the secret iconography (symbols) underneath. The later works of Johnny Warangkula are an excellent example of this: In his final years, Johnny worked to record his important stories in a powerful body of work, all of which are obscured by a wild and magnificent dotting technique.