I found these images by simply searching google for colourful street art interventions. The top image is interesting as the bottom of the staircase is ordinary, but as it spirals upwards the staircase becomes more distorted eventually transforming into a sculptural piece. The second image shows a study made from the surroundings. The artist has created the effect that there is a giant plug in the centre of the road, with the central road lines as wires. I like the concept of creating public art imagery from the surroundings. However, something like this maybe difficult to carry out as it would be socially unaccepted.