POTENTIAL TRAJECTORY Three different cities being compared by designing a tower that must be minimized the solar incidence that affects its facade and its shape. The tower is located in a context of high rise area. The system in which the tower takes its shape is different from the exercises done previously. Now the spiral which eliminates the units has bec ome a polyline and then it can insert inside the boundaries in a totally different way . In the points where the polyline changes direction there are extra elements that can differentiate the shape of the tower. It is also added the request to find the tower with the smallest possible area. Three different cities being compared by designing a tower that must be minimized the solar incidence that affects its facade and its shape. The city are Beirut, Barcelona and Fargo Using Goat for a limited time of 20 minutes I developed an array of towers that seek the best solution regarding the solar radiation incident on the facade of the tower. With this time limit the various cities have developed a number of different solutions to each other. For this research I used Goat with an evolutionary solver (Global, evolutionary (CRS2)), that implements the same basic ideas as Galapagos. Using Goat with a global optmization step it searches the entire parametric model space and identifies an intermediate solution close to the global optimum.