Walter and the concept of locks.

Walter's sand storm
Walter's sand storm was a big deal---BBB

Your sand storm reminded me of my year in Morocco. When we got them, everything got covered with sand. Our huts were not sealed, and the dust/sand came in freely.

Now there's a blast from the past!

The 'past' is right! It was actually some 60 years ago.
However, during my one year in Morocco, I had the opportunity to visit Madrid, Paris, and London. That's when the travel bug bit my behind, and I've been traveling ever since. I think I've been to 90 countries and all five continents.