Hidden cameras are associated with net falls in speeds, crashes and casualties when compared with visible ones.

BBC: Speed camera plan 'may cause deaths'

The spruce and pine trees all around are weighed down, more snow than tree, and the steep mountainside that falls away beneath the farm is hidden behind cloud.

BBC: Snowbound Slovenia

With the English actress Samantha Morton, hatted and crumpet-faced, her body hidden in a shapeless dress, as the mute girl who falls for Emmet.

NEWYORKER: Sweet and Lowdown