Channel 4 has brought back its red "warning" triangle in a campaign that reminds viewers of its remit to make controversial programming. The channel’s in-house creative department, 4Creative, made the spot. The ad features clips from recent programmes as a voiceover explains how Channel 4 was set up to take creative risks and then plough its profits back into programming. A red pyramid features heavily throughout the ad, referencing the symbol that appeared in the corner of TV screens in 1986 whenever Channel 4 aired something that might offend. The work was created by John Allison and Chris Bovil, and directed by Kate Dunn at 4Creative.