Initial Position
The group co4 observed street stalls all over the city of Cologne. Their analysis criteria were: visibility, personal service, improvisation, mobility, uniqueness, regular customers. They pointed out the following street stall main features: 1. rare and unique products, 2. personal service, 3. ability to adapt to the environment. Finally they presented the âsound stallâ, their idea was to use the advantages of a street stall to sell a modern, virtual product: ringtones in the street.