On the occasion of the museum’s 50th anniversary, the Guggenheim has invited approximately 250 artists, architects, and designers to imagine their dream intervention in Frank Lloyd Wright’s rotunda. A salon-style installation of two-dimensional renderings of their visionary projects will emphasize the rich and diverse range of inspired proposals. One of our favourites thus far is Italian architect Stefano Boeri’s proposal titled ‘Floating Void’, which is an external space that floats above the Guggenheim Museum. It could very well be the world’s coolest, and most expensive floating tree house.