Inverted Sky is based Marthe Ramm Fortun's site-specific project at Grand Central Terminal, in New York City. The lyrical guided tour of Grand Central Station was part of a performance series for Performa Biennial 2013, an international Biennale for performance art in New York.

Fortun's performances often interface with bystanders in public spaces, testing thresholds of boundaries, sometimes resulting in both memorising discomfort and humour. In Inverted Sky, the tour itself became somewhat of a spectacle, with many bodies interfacing with the individuals passing through the Terminal.