In autumn, the Cheshire Forest's trees first turn to glass, then vanish completely, leaving only their leaves suspended in mid-air
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In spring, they rematerialize from the leaves, like slow-motion whirlwinds flocking in the canopy before touching down
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Evolutionally,that is the reason why trees shed leaves in autumn. However later descendant trees (most of the ones we now know) have abandoned the rematerialization mechanics,thus leaves-shedding is an atavism