There’s plenty of action sports around these days, and ‘highliners’ push it to limits. They love a lot of air between them and the ground. And the more dizzying the spot, the better!

If you’ve seen any of the work of Seb Montaz, you’ll know to expect something special. This video, shot in Paris, follows on from the crew’s first efforts out in the Alps – and it’s stunning.

How do you top a 4000m highline in the Alps? With two skyscrapers in the middle of Paris. The two office towers of the Les Mercuriales are only 120 m high but the effect is still very impressive.