This week's "Detour" article presents three blue-sky ideas for reuse of the wasted space beneath an expressway overpass in the city. Although the article was written as a piece of fiction, the concepts might not be that far out: apparently the residents of Logan Square are looking to build a Chicago Park District Skatepark beneath the Kennedy Expressway. This skate park "with a roof" would be just one project in the interesting (and massive) Logan Square Open Space Plan that looks to create over 15 acres of useable open space in the super-densely populated neighborhood.