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Cf. 16:8 and the corresponding note [6]. In both of these passages man's ingenuity is shown to be a direct manifestation of God's creativeness.
The stately ships sailing through the seas, heavier than air, yet carrying man and his goods safely and smoothly across the waters, are another Sign for man. Ships are not mentioned, but (vessels) like the Ark: they would cover all kinds of sea-craft, but also the modern aircraft, which "swims" through air instead of through water.