Newton famously contemplated gravity when watching an apple fall from a tree (not actually hitting him on the head, as
seen here in LEGO by Brother Steven).
... why should that apple always descend perpendicularly to the ground ... [he described is thoughts in a later conversation] ... why should it not go sideways, or upwards? but constantly to the earths centre? assuredly, the reason is, that the earth draws it. there must be a drawing power in matter. & the sum of the drawing power in the matter of the earth must be in the earths centre, not in any side of the earth. therefore dos this apple fall perpendicularly, or toward the centre. if matter thus draws matter; it must be in proportion of its quantity. therefore the apple draws the earth, as well as the earth draws the apple.
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