Why Clojure idiom prefer to return nil instead of empty list like Scheme?

Question

From a comment on another question, someone is saying that Clojure idiom prefers to return nil rather than an empty list like in Scheme. Why is that?

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Answer 1

From The Joy of Clojure

Because empty collections act like true in Boolean contexts, you need an idiom for testing whether there's anything in a collection to process. Thankfully, Clojure provides such a technique:

(seq [1 2 3])
;=> (1 2 3)

(seq [])
;=> nil

In other Lisps, like Common Lisp, the empty list is used to mean nil. This is known as nil punning and is only viable when the empty list is falsey. Returning nil here is clojure's way of reintroducing nil punning.