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I.e., "which We alone have or could have created" (Zamakhshari and Razl). The above metaphorical expression is based on the concept of "handiwork" in its widest sense, abstract as well as concrete.
lit., ‘what Our Own Hands have created.’
If they are blind to other Signs of Allah, they can at least see the simple homely things of life in which they receive so many benefits from Allah's mercy. How is it that wild animals can be domesticated, and in domestication can be so useful to man? Man can use them for riding or for drought; he can use their flesh for food and drink their milk; he can use their hair or wool. Cf. xvi. 66, 80: and xxiii. 21-22.