Al Fresco is a participative and interactive initiative, which promotes collaborative work among visitors, neighbors and visitors. This temporary installation is based on a bottom up design and self-organized construction. Al Fresco is a bottom up project, designed to start from a simple geometry: a hand-held fan. This is then cut and folded to transform into a freestanding constructive element, that through multiplication and assembly gives form to a complex canopy structure. AlFresco is also an initiative of Bottom Up methodology, where the individual contribution of each visitor, neighbor or association, has an input in the collective creation of the installation. The methodology develops in a physical level, providing all visitors with a “fan” element, that they will use during the festival and later, after adding a drawing, a message or some color, they will incorporate to the collective canopy structure. Furthermore, a digital platform would be created with the fan templates and instructions of use so that families, neighbors and associations can produce their own elements for the installation. The result is a didactive activity, focused on Bottom Up as a design and logistic strategy, that shows how reusing a simple element, through parametric multiplication, and with the individual contribution of each participant, turns into a complex urban structure of public use.