A fictitious ribbon is a generic attribute of urban form production. This concept is not a norm, but an urban state of exception that force the generic to conform to the fi nite form of location. The concept will manifest a global urbanscape through various site-specifi c interventions. Take this ribbon and place it above the Hanoian old town quarter, it will take the form of the roof’s topography and mutate into a sky pathway. Put the ribbon below the ground, it twill turn softly into an urban ribbon that runs around the lake and alternatively goes up and down according to the existing urban structure. Two scenarios have been imaginated.