Barcelona's El Liceu opera house reopened on Monday with a concert to an audience of 2,292 potted plants. The event took place a day after Spain's three-month state of emergency came to an end. It was the work of Spanish conceptual artist Eugenio Ampudia, who said the inspiration came from a connection he built with nature during the pandemic: 'I watched what was going on with nature during all this time. I heard many more birds singing. And the plants in my garden and outside growing faster. And, without a doubt, I thought that maybe I could now relate in a much more intimate way with people and nature'