This website visualises the 3D City Model of Zurich with computer generated sketches that look as if it was hand drawn. Brilliant work by the GIS Competence Center of the City of Zurich, based on the openly available code by Nicola Raluca from ESRI. You can find more information about the Code at the sketch edges feature in the ArcGIS API.
Have fun by navigating through the city of Zurich and select your favourite view :)
