WHEN a friend told her what it looked like from the outside, Elham Ahmed had to bring her family down to see the inside.
And she wasn’t disappointed.
People who venture into the monumental rabbit warren that completely fills cathedral square feel a long way from central Sheffield.
They explore darkened tunnels and chambers and emerge into brightly coloured halls with high domed roofs.
Elham, aged 24, of Firth Park, said: “It’s an amazing place. It makes me feel weird, it makes you wonder where they got the idea.
“My friend told me she’d seen this amazing structure outside the cathedral, so eight of us came down to see inside.”
Her sister, Leena, seven, added: “I think it’s great, it makes me feel peaceful.”
The inflatable Luminarium was built by arts organisation Architects of Air and all the light inside is natural.
Richard Spiby, exhibition manager, said: “Most people say it inspires a sense of awe and wonder.
“For us it was quite a tricky set up because of the trees and tram shelter. This structure comes in nine sections but it has been reconfigured to fit in.
“People are encouraged to sit down. But there’s no running and jumping.”
The Luminarium is in Sheffield until Thursday.