A great collection of quotes here (taken from the wonderful Wildern English) to show Steinbeck’s use of light and dark in Of Mice and Men. Consider where the quotes appear and what they could symbolise.
To help develop your understanding take a look at the following video too. Try to link Steinbeck’s use of light/dark to the era of the 1930s to also hit AO4.
Miss O
miss, the dog ate my homework 