of the London department store Harrods.

"She's given us so much," Slegers added. "There are so many things to say about Mariona, because she does so many things so well. She has given us that next level."Technically and tactically - her intelligence is really high level. Her work ethic is unbelievable. You can see it in games, but you can see it on the training pitch as well.

"Last but not least, she's a winner."After Arsenal beat Tottenham 5-0 at Emirates Stadium, a journalist described Caldentey as the conductor of an orchestra, with eight legs like an octopus.The analogy surprised Slegers but she admitted it was a good description.

Arsenal captain Kim Little, who has played alongside Caldentey this season, said she has been "incredible" for the team."She came in from Barcelona and had a great impact on the team, on a personal level and also with how we play," she told BBC Radio 5 Live.

There will no doubt be mixed emotions for Caldentey when she faces Barcelona in Lisbon.

She was "underrated" but "now finally appreciated" by those in Spain, said Tikas, but will she come back to haunt them?"It's quite the dichotomy. You've got really, really small chips with really small structures, and it takes this massive facility with all the infrastructure to be able to make them... Just the sheer complexity, the amount of systems that it takes, is staggering."

Inside the "Gowning Building", workers dress in protective clothing before crossing a bridge that is supposed to create the cleanest environment on Earth, in order to protect the production of these extraordinary microscopic transistors that create the microchips underpinning everything.Konstantinos Ninios, an engineer, shows me some of the very first productions from TSMC Arizona: a silicon wafer with what is known as "4 nanometre chips".

"This is the most advanced wafer in the US right now," he explains. "[It] contains about 10 to 14 trillion transistors... The whole process is 3,000 to 4,000 steps."If you could somehow shrink your body to the same scale and get inside the wafer, he says that the many different layers would look like very tall streets and skyscrapers.