evidence: The MSG Sphere’s 580,000 sq ft fully programmable LED screen, named the Exosphere, was illuminated for pre-launch testing overnight to celebrate the Fourth of July. The show started with a welcome message, "Hello world", followed by fireworks and stars and stripes animations, a moon in a night sky and an imposing Halloween pumpkin. Videos showed the screen overshadowing cars – tiny in comparison – on a nearby road. [...] Built to host concert events, the Las Vegas structure will have capacity for tens of thousands of people and is reported to have cost $2bn (£1.6bn) to construct. It has been built by Sphere Entertainment Co in partnership with the sports powerhouse Madison Square Garden Entertainment. "The Exosphere is more than a screen or a billboard – it is living architecture and unlike anything that exists anywhere in the world," said Guy Barnett, senior vice-president of brand strategy and creative development at MSG Sphere.