Letterbox

I'm always on the lookout for unusual letterboxes (is that the right name in British English?). This one struck my eye today during my lunch stroll. I rather like it.

Today was warm. So the library was very quiet. And I hear the parks were very crowded again. People start by keeping their distance. Younger people bring beer. And social distancing is quickly forgotten. And who cares? For them Covid results in somewhat of a cold. No matter to them.
Who cares if they spread it to their parents, grandparents, siblings, neighbours or the careful librarian?