Shells

The cure for anything is salt water - sweat, tears, or the sea.

~ Isak Dinesen

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I think the reason the sea puts shells on beaches is so you watch your step.  You look down and make yourself aware of the world around you - it's diversity and beauty.  Even it's danger — some of the shells are sharp!

Also I think that the sea puts shells on beaches because of the tides and because the things in the shells died so the sea is kind of spitting them up.

Also I think the sea puts shells on beaches because of magic.