‘Step into the heart of the Big Bang,” says the advert for Halo, a walk-in, 360-degree, audiovisual installation about to open in Brighton. Come off it, I want to retort. You couldn’t “step” into the Big Bang without first travelling 13.8 billion years back in time and then being extremely miniaturised. After all, the universe was, according to one estimate, just 17cm in diameter at its inception.

What’s more, it was dark inside the Big Bang. In fact, there was no light at all. True, if you stuck around for 380,000 years, according to Nasa, you might have been able to see something because that was when free electrons met up with nuclei and created neutral atoms that would have allowed light to pass through. But who has 380,000 years to hang around waiting in the dark?