This September, a Set of the Most Delightful Postcards...

with the most charming words...

were sent by the inimitable Joan Vigliotta...

for the Heath Robinson postcard above, Joan wrote: 

"What I love about this image is that it really does look plausible--until you think about it very much. Heath Robinson always presents it all in such a reasonable, well-executed way..."

Yes, of course (in the illustration, from "How to Live in a Flat," the laundry lines are all being held aloft by balloons). 

Couldn't have ever said it better.