The veins of life

One day I came across a roadside tree whose leaves caught my attention. It is shaped like a heart or perhaps, like an apple. What I find most striking and beautiful are the veins, so subtlely well defined. Nature is simply marvellous.

An excerpt from William Blake's poem - "Auguries of Innocence" :

To see a world in a grain of sand
And heaven in a wild flower
Hold infinity in the palm of your hand
And eternity in an hour.

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What do you "see" in the veins of the leaves?