BBC Four is a BBC television channel available to digital television (Freeview, satellite and cable) viewers in the UK. The part successor (with CBeebies) to BBC Knowledge, it launched on 2 March 2002.
In September 2005, the channel's new idents based on the theme of an "four" and optical illusions, 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.
Off Air Caption
Swimming Pool
Seagulls
Books
Flowers
River
Christmas Ident
Promotions
Misc
ECP
