The results showed that colour had a large impact on people's guesses for some pictures, but for others there was very little difference. For me, colour didn't actually impact the guess much since I don't know when colour photography became mainstream, and even then, you get B&W pictures even today.

The hardest part for me was having no context of where the pictures were taken (although I should have guessed in the US). The picture of the farmers & the horse could have been taken today in many parts of Africa.