Beyond the Centerline is a competition organized by New York real-estate company Fisher Brothers that tasks the entrants to come up with innovative ways to transform the congested boulevard along New York's Park Avenue into a hive of activity. Architects and designers have come up with a wide range of plans and ideas for the contest including:

• An underground rock-climbing wall

• A huge cascading waterfall

• A route for kayaking commuters.

• An aquarium, elevated walkways

• An elevated basketball court and a yoga studio topped with an undulating grass roof.

• An ice rink for skating or playing hockey

• A waterfall that flows down the massive mountain-shaped structure

• A made-up forest offering a habitat for wildlife

• A subterranean level, below the streets featuring shops and cafes

• A subterranean level, below the streets to create multiple levels for food markets, theatres, sports studio and a bouldering wall.

• A nine-meter -tall field of stalks and a green wall

Among the 150 entries 17 has been shortlisted.