Editing BBC Four (section)

==Presentation==
{{Main|BBC Four idents|History of BBC television idents#BBC Four|l2=History of BBC television idents}}
The channel's initial series of [[idents]] were generated [[Audio visualisation|dynamically reflecting the frequencies]] of the continuity announcers' voice or of backing music and were designed by [[Lambie-Nairn]]. As a result, no two idents were ever the same. The first continuity announcer was [[Zeb Soanes]].

When the channel first started airing, it used the slogan "Everybody Needs A Place To Think", but the BBC stopped using this several months after the launch. However the BBC Four logo and above slogan can be found, engraved on benches along the [[South Bank]] in London, between the London Eye and [[Waterloo Bridge]].

On 10 September 2005, the channel began showing new idents comprising a central BBC Four logo surrounded by four quadrants which show different stages of the same footage thus making for a sort of optical illusion; for example, a swimming pool where a person on an inflatable ring appears in the bottom-left corner, though ripples don't enter the remaining quarters. Although the image appears as one at the start of the ident, by the end it is clearly four separate images. These were the longest-running idents ever used by the BBC - they lasted until the channel's rebrand in 2021, however, the "quadrants" theme continues to this day.

In March 2019, BBC Four added several new idents inspired by "[[oddly satisfying videos]]" in tandem with the quadrants theme, originally premiering for a programme season honouring the 30th anniversary of the [[World Wide Web]].