In 2013 I gave a two-day workshop to students of the summer school of the Hochshule Anhalt, better known as the Bauhaus in Dessau. The aim was to introduce students to various facets of urban design (material, form, design), public participation and to test their design life-size at the project location. We reversed the classic design process from "top down" to "bottom up". First, the students had to do map-based interviews on the street. Where dit the urban design need improving? The students then proceeded to perform a 'guerilla-style' urban design intervention on the project location using cardboard, tape and ribbon. What worked and what didn't? On the second day, the students translated this into an urban design.