This is a small workshop setup that I did together with tobias løssing for some students at urban design at A&D. We gave a talk on the use of parametric constraints in design and ended up with this little model. The idea is to use a small web-based 3D tool to play with rule-based designs. The interactive model can be manipulated in four different layers according to the given rules by the students. The model should function as a basis for discussing rule-based designs - the students would design a set of rules, play with the model and see if they could generate something usefull or at least some form that would correspond to their rules. Changing the rules should then result in outcomes slightly different. The setup worked ok, however the workshop was far to short to really test the potential of the model - but feel free to use it!