Theo Games Petrohilos shares a darkly comic vision of an imagined future where the sale of air rights for Manhattan properties develops into economic hysteria.

Landscape designer David Seiter champions the ecological and aesthetic benefits of informal plants - weeds - in urban space, and catalogues the uses and cultural significance of New York's native flora.

In the second of a series of interviews with visual artists, Emily Henretta discusses how the process of collage and the experience of cities inform each other.

In the first of a series of interviews with visual artists, Roberto Mollá discusses the influence of architecture and the urban environment on his work.

An illustrated slide show about tidal in-stream energy conversion and what New Yorkers need to know about its potential to redraw the map of power generation in the city.