They also reference the recording of their final album, Made in the AM.
First, the headphone sticker on the wall was last seen when Liam Payne was recording vocals during their One Direction days.
The image in question showed him staring at the sticker while singing into a microphone.
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Earlier this month the odds on the band reuniting as a five-piece were slashed after Zayn Malik spoke out about his former bandmates.
In an interview Zayn revealed he prefers Niall’s music over the rest of the band’s work.
Since then, the odds on Zayn being a part of any kind of reunion have been slashed to a fantastic 1/2 from Ladbrokes.
At the moment, odds on the gang getting back together this year are at 1/4 – the best they have ever been.
Ladbrokes’ Alex Apati commented: “1D fans will be delighted Zayn is even talking about his old bandmates, but news that his odds have been slashed to take part in the reunion will be even more music to their ears.”