The metonymic meaning of a sign means
that the meaning becomes conveyed through association rather than comparison.
To a to indicate a larger whole, use is made of one very recognizable element of that whole,
which can symbolize it.
In language it becomes word 'press' used to denote journalists or the media,
'the crown'
is used to indicate the royal family and the 'Binnenhof'
for the political power of the Netherlands.
Film mainly consists of images and in images work metonyms
better than metaphors. A metonym can be very simple,
but can also be a portraying a concept that cannot be seen.
The experience of wealth, anger, love or incarceration cannot be filmed,
but a filmmaker can make it palpable through the actions and rituals of this film experiences.