PLEASE start with the nonspoiler video here:    • The Talos Principle [No Spoiler edition]  
And go buy the Talos Principle for yourself. Croteam are good at more than Serious Sam.
This video is kind of like 'The Talos Principle in 20 minutes', as I go through the story, telling it the way I perceived it on my first playthrough. Since then I've researched the game a lot more and am happy to say that there's even more to it than I had experienced on my playthrough. But it meant to so much to me that I've told you how I experienced it. I hope you enjoy it as much as I did!

I was going to make this video unlisted only, but then I realised the format was quite good for telling the story of it to people who hadn't already played it, so I've instead settled with just making it obvious that it will spoil everything.