I recently came across the Holsteiner Stairs pictured below and I love them. They are a simple idea, well executed and bring a big injection of colour and attitude to what could have been a fairly bland streetscape.
The painted stairs, in Wuppertal, Germany are by the artist Horst Glasker. The piece entitled Scala features a series of individually painted steps and on each step is a different German word. The words are used to describe different relationships between humans. The piece is not just beautiful it is a well thought out social commentary.
The piece is now five years old but the ideas are as fresh today as ever and I could see this idea being replicated in a number of cities.