ABBA has delighted fans with the announcement of their long-awaited hologram tour.
Tweeting from their ABBA Voyage account, the group said: London. Join us. abbavoyage.com 02.09.21."
According to reports, a succession of shows are set to take place in a purpose-built, 3,000-capacity arena in London.
The state-of-the-art concert will feature all four members of the greatest pop group of all time, Agnetha Faltskog, Bjorn Ulvaeus, Benny Andersson and Anni-Frid Lyngstad, performing as holograms of their younger selves, according to The Sun.
According to the publication, the venue will open next spring, and the venture has already racked up a eight-figure cost.
However, it is expected to make hundreds of millions. But how would it work?
How does a hologram concert work?
If you've seen the holograms of Tupac and Michael Jackson, you might have been blown away by the amazing technology.
But holograms aren't just used to bring dead people back to the present.
In the case of ABBA, it will take fans back to the pop group's heyday – and will no doubt be an incredible experience.
But how does it all work? Firstly, it's worth mentioning that the holograms you've heard of or seen are not technically holograms.
The definition of a hologram is a "three-dimensional projection of diffracted light that retains the depth of the depth of the original physical source it is displaying," according to Interesting Engineering.
Instead, the "holograms" used at concerts derive from a parlour trick that dates back 200 years, called Pepper's Ghost.
Pepper's Ghost was jointly invented by engineer Henry Dircks and scientist John Henry Pepper, and was first shown in a stage production in the 1960s.
This technique uses a reflective pane of glass that is angled towards a booth underneath the stage.
Interesting Engineering explains: "Thanks to the glass, the image of actors in the booth are projected on stage with a ghostly translucent quality."
Instead of being 3D, this technique is actually a 2D projection that gives the illusion of being a 3D hologram.
However, if the audience was to go any closer the image would be squished.
But for simplicity's sake, they are referred to as holograms.
According to the Sun's source, all four members of ABBA will be there for opening night, and will unveil their "ABBA-tars".
The source said: “And they will finally unveil their ABBA-tars, which are like holograms of themselves. The show will feature the ABBA-tars performing and speaking to the audience.
"It will be like taking a step back in time for those watching. Fans should hold on to their hats because this is going to be one wild ride.”