The Ladder

'There's the ladder without-a-top,' said Silky, pointing. 'No one has ever climbed beyond the three thousandth rung, because they get so tired. And there's the tree-that-sings. It's singing now.'
So it was - a whispery, beautiful song, all about the sun and the wind and rain. The children could understand it perfectly, although the tree did not use any words they knew. It just stood there and poured out its song in tree language.

Enid Blyton - The Folk of the Faraway Tree