During most of an aspiring academic's schooling one (at least in my experience) is repeatedly told that quoting/reproducing other works is fine, if given credit. As long as you cite your sources, all is good. And of course this is true, in the sense that you will not get penalized for plagiarism.
But today I was left wondering... is it true? I had a think and in my field (computer science) I can not recall any quotations or reproductions of graphs/tables in essentially any of the works I have read, other than perhaps some quotes at chapter starts for entertainment value.
Whenever one references another work in my field one always seems to reword or summarize the reference, even if a direct quote is perfectly functional. Which leaves me wondering, is there an unwritten rule against quoting literally in some fields?