[alexpotato]

I would think you could go a long way with just creating an ESP style game: https://en.wikipedia.org/wiki/ESP_game

In this talk, the creator also goes into how they created a version to actually locate the key points in the image: https://www.youtube.com/watch?v=tx082gDwGcM

[erikduhaime]

Yes I am a huge fan of his work! He went on to found DuoLingo, which has inspired us a lot. I recommend everyone watch the talk you linked and also his TED