A new robot will enable street artists to create murals in places previously thought to be inaccessible. In its first full-scale demonstration, it created a five-color mural of a woman on a chimney.

“Other buildings have been designed to meet these sustainable standards, but they are small—usually 2,000 to 6,000 square feet,” said Earth Day founder and Bullitt Foundation President Denis Hayes.

This scale model of The Bow in Calgary was constructed using nearly 8,000 pieces of Lego. It stands about one metre high. The real tower is 236 metres (774 feet). (Roy Nelson) ...