TITLE: Is there any book similar to "Halmos Naive Set Theory" in Category Theory?
QUESTION [9 upvotes]: When I wanted to learn set theory in high school, I found Halmos Naive Set Theory  book very readable and understandable. But now, at university, I have been searching for a similar book in category theory, but I haven't found any book like that until now.  
What is your suggestion?
Thanks in advance.

REPLY [2 votes]: Leinster recently came out with a fantastic book
Basic Category Theory, Tom Leinster, 2014
It is shallow in terms of proofs but it is deep with examples. This really will help you understand category theory from whichever mathematics you may already know best.