Question

what is the shaft of beauty, towering high ??​

Answer 1

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The small sapling grows into a tall and high arrow like tree which stands stately in beauty.

Answer 2

This line is from the poem The Heart Of The Tree By Henry Cuyler Bunner. This line means that the tree is beautifully branching out and its narrow stem is standing tall bearing resemblance to a beautiful tower. The poet has used this line to compare a flag he has planted to this tree.