If you're someone from the government and you meet people from other countries, you want to know who you're dealing with. It's the same for them [in Valerian].

My biggest surprise is probably the level of involvement of all the artists [in Valerian] who participated at every level.

I wanted to prove that I could do something, so I made a short film. That was in fact my main concern, to be able to show that I could do one.

Cara [Delevingne] I wanted to be sure that she would be involved. 'Cause she didn't do a lot of films before I met her, so I didn't know if she was serious and so I push her a bit.

For example, in your house, you have the heater on the ground itself. Here, it's the gravity. No matter where you are, that's where the gravity is coming from. It's almost like a carpet that you put down. If you're on the other side, it doesn't matter to us because we're still walking on the ground. Actually, at the beginning of the film [Valerian], we see when they install the gravity system.

It's always the small people who change things. It's never the politicians or the big guys. I mean, who pulled down the Berlin wall? It was all the people in the streets. The specialists didn't have a clue the day before.

I'm a big Star Wars fan.