We often give examples like being 'as tough as a rock' or looking 'as lifeless as a rock'. I agree that rocks are tough but I'm not going to buy your idea that rocks are lifeless. Rocks are full of life, every single one giving out an unique message. The one in the above pic seems to say 'Trust me, I won't let you down'! The only thing that's needed is an eye for details and the will to imagine!
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The elephant on the highway!