The urban spaces that arise as a result of urban shrinkage and decay are loosely defined (Franck & Stevens, 2007). The ambiguity of these spaces provides a potential outlet for accidental or spontaneous encounters, informal activities and alternatives to our increasingly commodified, controlled and privatised 'open' urban spaces. Many topographic unions, particularly those that are easily accessible and large enough to contain interesting physical features, have the potential to become 'dynamic 'indeterminate spaces'' or 'slot areas' (free zones).As undefined ambiguous places, these sites are highly inclusive of environmental renewal within and outside themselves. This means that interstitial sites temporarily or non-temporarily allow for any movement to take place in the city. The design task begins with an urban memory path based on void and leftover places.The understanding of the sites as carrying memories depends on the audience. They can be anyone, human or non-human. So, let's make the audience the players. And we, the designers, are the directors.