I have borrowed this from the original under the YouTube conditions.
The owner of this great video explains:
How to fold a shirt under 2 seconds. This step by step guide shows you how to fold a shirt very quickly. Works on all short sleeved tops including t-shirts and polo shirts. Great tutorial and easy to learn.
Someone taught me the technique last year, I’ve been told its a Japanese technique which dates back to the eighties, but who invented it and when exactly I don’t know.