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==Παρουσίαση==
===Improvised===
[[File:BBC Four 2002 ident.jpg|thumb|250px|One of the improvised idents, used between 2002 and 2005]]
The BBC's "cultural" channel [[BBC Four]] was launched on 2 March 2002 as a successor to [[BBC Knowledge]]. As a result, the channel was to show a broad variety of programming. To show this, Lambie Nairn devised the idea of an improvised ident that [[Music visualization|reacted to the frequencies]] of continuity announcers' voices or the background music of the ident.<ref name="TVARK bbc4">{{cite web|title=BBC Four Idents|url=http://www2.tv-ark.org.uk/otherchannels/bbcfour.html|publisher=TVARK|accessdate=31 July 2011}} Contains videos of the idents.</ref> As a result no idents were ever the same, however variations were produced featuring different visualisations, such as semi circles, vibrating lines or shafts extending from the bottom surface.<ref name="TVARK bbc4"/>
The channel logo featured the new style of logo with the channel name 'Four' located in upper case inside a black bow with the BBC logo above it. This logo was present in the bottom right corner of idents and promotions for the entire duration.<ref name="TVARK bbc4"/>
The launch slogan of the channel 'Everybody needs a place to think' was present on all launch promotions.<ref name="TVARK bbc4"/> Promotional style featured the BBC Four logo present throughout the promotion with the details appearing in white in the top right corner of the screen, aligned right.<ref name="TVARK bbc4"/> If the background image was too light, a translucent black box was placed over the top third of the screen. The channel also used a DOG, however this was not the new logo, but a one line style used by the previous channel with the BBC logo and 'FOUR' to the right of it in the same size.<ref name="TVARK bbc4"/>
===Four sections===
[[File:BBC Four Pool.jpg|thumb|250px|One of the idents introduced in 2005]]
BBC Four's identity changed on 10 September 2005. These new idents, designed by [[Red Bee Media]], featured an image made up of four parts but undistinguishable until something interacts within the scene.<ref name="TVARK bbc4"/><ref name="bbc4 official">{{cite web|title=BBC Four - Idents|url=http://www.bbc.co.uk/bbcfour/idents/|publisher=BBC|accessdate=13 December 2011}}</ref> Idents included:
*Seagulls which fly between the pictures, often getting closer or further away than previous.<ref name="TVARK bbc4"/><ref name="bbc4 official"/><ref name="TV Room I1">{{cite web|title=BBC Four September 2005 - Present|url=http://thetvroom.com/bbc-uk/bbc-4-02-01.html|publisher=The TV Room|accessdate=13 December 2011}}</ref>
*A girl climbs a ladder against a bookcase. As the ladder is moved, the ladder section in a different segment moves differently. Equally the girl may climb off the bottom of the screen to reappear at the top. In addition, whenever she replaced a book, another fell out in a different segment.<ref name="TVARK bbc4"/><ref name="bbc4 official"/><ref name="TV Room I1"/>
*A mountain scene against a lake where a drop of water causes ripples in more than one segment, before a drop rises from the sky/lake in another segment.<ref name="bbc4 official"/><ref name="TV Room I1"/>
* A child in a swimming pool swimming with a ring. The views are from different angles, for example looking down from the air and underwater looking up at the surface.<ref name="TVARK bbc4"/><ref name="bbc4 official"/><ref name="TV Room I1"/>
* Bees collecting nectar that appear elsewhere when flying across borders.<ref name="TVARK bbc4"/><ref name="bbc4 official"/><ref name="TV Room I1"/>
The black box logo was retained from the previous look but moved to the centre of the screen to divide the four segments.<ref name="TVARK bbc4"/><ref name="bbc4 official"/><ref name="TV Room I1"/> Promotional style also changed. The BBC Four logo would remain in the bottom corner of the screen throughout the promotion, but would be overlaid by the programme information in an [[Opacity (optics)|opaque]] coloured box in the lower right segment of the screen, with the BBC Four logo in the centre.<ref name="TVARK bbc4"/><ref name="TV Room bbc4 P1">{{cite web|title=BBC Four September 2005 - Present Promotions 1|url=http://thetvroom.com/bbc-uk/bbc-4-02-10.html|publisher=The TV Room|accessdate=13 December 2011}}</ref> This was altered in 2008 to a BBC Four box appears in the middle of the screen from which the video is wiped out anticlockwise round the logo from the right revealing the programme information to the right of the logo.<ref name="TV Room bbc4 P1"/>
The DOG for the channel remained the same in the [[4:3]] screen size safe zone;<ref name="TVARK bbc4"/> this was only changed in 2011 when it was switched to widescreen [[16:9]].
== Παραπομπές ==
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