It is all quite Logical! - Not
The deep end is a very good end to start with logic.
I have two coins in my hand with a total value of 30 cents. One of them is not a ten cent piece. What are the coins?
Logic is about true and false. A cat is black or not black. A sock is white or black but cannot be all white and all black.
Here is a very cool example of logical deduction.
There are three boxes and the labels on them are all incorrect. One box say it contains only white socks. Another box says it contains only black socks. The third box says it contains a mixture of block socks and white socks. Your task is to choose one sock from one box and relabel the boxes so they are all correct.