Ban Ki-moon, the UN secretary-general, this week opened a memorial to journalists killed in the line of duty.

MacCormac Jamieson Prichard Architects collaborated with artist Jaume Plensa to create the 10m-high glass sculpture, which sits on the roof of the new wing of the BBC’s Broadcasting House in Portland Place, London. Entitled Breathing, it will project a beam of light up to 1km in the sky every night at 10pm.