At the edge of the horizon stands a house made of glass, shining and vulnerable. Built by two inseparable friends, their friendship reflected in every pane. They stand there proudly, looking at their creation, with stains all around the house. Stains from happy days when they created their own language, and stains from all their adventures, now just ghostly memories in the fractured glass. But one day, one of them suggests putting a window in one of the walls. The other disagrees, and a crack...