BBC Four

Background
BBC Knowledge was an early BBC digital channel available in cable, satellite and terrestrial broadcasting prividing a programme of documentary, cultural and educational television. The channel would finally close down in 2 March 2002 and was replaced by BBC Four.

1st Logo (June 1, 1999-2000)
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Nickname: "Ladders of Learning"

Logo: We see cartoon characters climbing ladders on an orange background, while showing items like a magnifying glass, a telescope or a roll of paper. Eventually, the screen is centered in one ladder, while the BBC Knowledge logo appears below.

FX/SFX: Hand-drawn, cartoonish animation.

Music/Sounds: TBA

Availability: Extinct.

Editor's Note: None.

2nd Logo (1999-????)
Logo: TBA

FX/SFX: TBA

Music/Sounds: TBA

Availability: Extinct.

Editor's Note: None.

3rd Logo (2000-2002)
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Nickname: "Circles"

Logo: We see several sorts of circles or rings zooming quickly towards the screen while the background changes color: First, a ring made of flame on a red background, then a ring of red numbers on a green background, a water puddle on a blue background, a spinning ring of metal on an orange background, and finally a green eye iris on a background of the same color. All of this repeats.

FX/SFX: TBA

Music/Sounds: An "orchestral" version of the previous music.

Availability: Extinct.

Editor's Note: None.

Background
BBC Four is the 4th BBC channel to air on March 2, 2002, replacing BBC Knowledge on the same day, though it was planned to launch in 2001 and had plans dating back to 2000. It's programming consists of a similar focus to that of the former channel post-launch, and runs from 7PM to 4AM on the CBeebies channel.

1st Logo (March 2, 2002-September 10, 2005)
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Nickname: "Improvised"

Logo: On a black background, there are CGI shapes, usually having purple or blue lights, that react to the music and the voice of the announcer. The BBC Four logo (a black box with the BBC logo at the top and "FOUR" in Gill Sans at the bottom) is on the bottom right corner.

FX/SFX: The shapes reacting to the music.

Music/Sounds: Depends on the variant, though a continuity announcer is present.

Availability: Extinct.

Editor's Note: As this ident's animation was synced to the audio of the announcer and/or music, it stands out with the fact no two idents were never exactly the same.

2nd Logo (September 10, 2005-)
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Nickname: "Four Sections"

Logo: 4 different sections of the screen are shown, with the illusion that these are part of the same video. In the middle, the BBC Four logo can be seen. Several different idents have been made, one of the most famous being a "single" video of a lake with mountains in the distance, and ripples appear both in the lake's reflection and in the sky.

Later Variant: Beginning on October 20, 2021, with the introduction of the BBC's new logo, the idents were altered a bit. The square in the middle is gone, with the new BBC logo on top and the text "FOUR" in the BBC Reith font on the bottom, like the new BBC logo. The "Subtitles" graphic is now placed in a full widescreen picture, rather than being in its original place of a 4:3 picture.

FX/SFX: Live action.

Music/Sounds: Depends on the variant, but there's a continuity announcer present. The main theme uses loud synth squeaks, and ends with a guitar note.

Availability: Current, being used for over 15 years as of January 2021, making it one of the most long-lived idents seen on British TV.

Editor's Note: None.

3rd Logo (October 20, 2021-)
Nickname: "Four Sections II"

Logo: TBA.

FX/SFX: TBA.

Music/Sounds: TBA.

Availability: Only seen in the promo end-boards and break-bumpers.

Editor's Note: TBA.