[3] It was released worldwide on 14 July 2017 and serves as a companion piece to Coldplay's seventh studio album, A Head Full of Dreams (2015).

[5] On 21 November 2016, Chris Martin announced the EP title on the band's official Twitter account, it is the same as an interlude track from A Head Full of Dreams (2015).

[18] Reviewing for AllMusic, Stephen Thomas Erlewine comments "Coldplay haven’t entirely been sucked into the machinery while trying to subvert pop music from within", giving the EP three and a half stars.

[21] Pitchfork's Jamieson Fox gave the EP 5.8 out of 10, writing "Kaleidoscope isn’t going to kickstart Coldplay’s critical reappraisal, nor does it deserve to.

[22] Writing for PopMatters, Mike Schiller comments "There’s no story to be told, just a small collection of tunes, some of which work beautifully, some of which fall utterly flat", giving the EP five stars out of ten,[23] and Jon Dolan, reviewing for Rolling Stone wrote "Titled after a soothing interlude from the band's 2015 LP, A Head Full of Dreams, this five-song EP continues that album's mood of tranquil satisfaction" giving it three and a half stars.