A clever decision it is for organizing such a beautiful contest. It will increase others knowledge.
Flag is the far most identification sign. We must know what are the secret behind each country's flag. What are the deep meaning hidden inside it.
I have done a complete and compact analysis about my country flag. If you are interested you can read here

My entry
https://steemit.com/hive-179660/@shahid2030/story-behind-my-country-flag-by-shahid2030