If you're familiar with modern Heathcliff, then you've no doubt seen plenty of Gallagher's funny window art, in which the windows barely make any sense structurally, with the characters behind them frequently look like little more than cardboard cutouts.
These things aren't really *super-duper* unusual for comic art, but with the way Gallagher's been pushing the strip in reductionist ways the last few years, it all tends to get slightly more silly with each passing year. Imagine my surprise then when I was reading some old French-language "Balthazar" comics, and I noticed that de Moor seemed to have anticipated all this in the mid-60's!
What I've done above is to cut out panels from two different comics pages and stitch them together. I doubt any explanation is necessary when you look at the two buildings. And for those who want to see what the full pages looked like:
(right-click as needed)
They're hilarious when you look at the little details, for example Grandpa clearly standing on the floor inside the house, with the lower window half open, yet somehow he's also in front of the upper half of the window. Only real explanation I know of is that he's a VERY flat man.