What other show or entertainment does P+P's tone remind you of?

I've been wondering, but it's hard to put my finger on it. Can someone think of a show, movie, comic strip, book etc. that inspired the particular tone of the P&P series, or that has a similar type of humor?

A while ago I was reading the Calvin and Hobbes comic strip, and its way of presenting fairly standard children's adventures with a strange mixture of adult-like philosophical reflections, surrealism, flights of fancy, irony, sarcasm and warm nostalgia strongly reminded me of the unique style of P&P's scripts and visualizations.

Of course mentioning Calvin and Hobbes brings to mind Peanuts as well....

Anyone?

Dicky