Hello rojosuiza...it's very nice to meet you!
I thought it was remarkable too! I suppose it is the same principle as the wine barrel. Very clever...and it has stood the test of time!
Very best wishes to you....Pam.
★˚Merry★* 。•˚˛˚˛•。★Christmas!★ 。* •˚。 °。˚˛ *
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Photo taken in Butlers Gorge TAS 7140, Australia
Misplaced? Suggest new location