Flikr co-founder Stewart Butterfield, created Slack in 2013 was designed to offer a digital workspace where employees can communicate with each other. Careful thought was place in every aspect of the design. "We lined the portals so as to reflect and extend the view of the London rooftop horizon and capture the movement of passing clouds, planes and the city's birdlife," explained the architects. View and read more about the beautiful monochrome design by clicking the "Read More" button.