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志愿者的任务很简单，每个人会看到两两一组出现的一些图画，每组中一幅出自著名抽象艺术家之手，另一幅是业余爱好者、婴儿、黑猩猩或者大象的涂鸦。
This is from the Standard Course Book of HSK5, section 18.
What is the meaning of 之手? His hand? 之 has many meanings, while 手 I suppose means hand. I know the 之 as the third-person pronoun: him, her, it, them. Does it make sense here?
之 here is a more literary version of 的 (possessive marker) XX之手= hand of XX or XX's hand
[出自] XX [之手] (from XX's hand) = [by] XX
[出自]著名抽象艺术家[之手] = [by] famous abstract artist
More example of 之手 (hand of):
[借]XX[之手] (borrow XX's hand) = [use] XX to
曹操[借]孙权[之手]杀关羽 = Cao Cao[used] Sun Quan to kill Guan Yu
Notice: you can replace 借(borrow) with the more literary 假(borrow)
"出自....之手" = drew/written/made by....
