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Lit., "and they are utterly lowly" or "submissive". The "prostration" referred to in this and the next verse is obviously a symbolism expressing the intrinsic subjection of all created beings and things to God's will. See also 13:15 and the corresponding notes [33] and [34].
In view of the separate mention, in the next verse, of animals and angels, the "things" referred to here apparently denote inanimate objects and perhaps also living organisms like plants.
I take "things" here to be inanimate things, for the next verse speaks of living, "moving creatures" and angels. By a metaphor even such inanimate things are spoken of as recognising Allah and humbly worshipping Him. Even their shadows turn round from right and left according to the light from above, and they humbly prostrate themselves on the ground to celebrate the praises of Allah.