in a Norse mythology legend…
Thor took shelter from a thunderstorm under an oak tree.
Hence the belief that an acorn on a windowsill will
prevent a house from being struck by lightning...
and why popular window blind pulls are shaped like acorns
Warning…
if you sit and shelter under the oak tree here…
Beware of squirrels gathering Thor’s acorns!
Squirrelizer...still one of my favorite iPhone apps!