The design for a home for works of the American sculptor Alexander Calder has been unveiled. The location is Downtown Philadelphia and the budget is close to 70 million euros. This joint project of the Swiss firm Herzog & de Meuron and the Dutch garden designer Piet Oudolf exchanged the traditional museum format for a sequence of concatenated spaces and gardens.

In the scheme, much of the 1,673-square-meter, 2-story building is buried, with the galleries carved out underground. Oudolf’s gardens stretch out from a walking path and surround Calder sculptures and the visible part of the building, with its metal cladding that blurs the lines between architecture and the natural environment. Completion of construction work is programmed for 2024.