Men and sheds cartoon.
Cartoon of a gardener emerging from a ladder in what looks like a cold frame
He is saying “It looks like a cold frame but it’s actually the door to the shed’s cellar”
This is a joke about the cliche of the stereotype of the man and his shed – where the garden shed is a man’s ‘den’ or hideaway from his family, where he can do manly (though unthreatening) things.
Part of the joke is that you wonder why the garden shed would have a cellar, and what might be in it.
It is a cartoon about masculinity, male territory, territoriality, men’s interests, gender roles.