Pure concentration.

This morning I popped into see mum and dad, and found dad engrossed in his new toy. He's pretty good when it comes to email and the internet, but he's just bought himself his first tablet. (Mum on the other hand, can't even turn a computer on, but has had a tablet for over a year - think he felt he needed to catch up!)
I made no secret I was taking his picture but he was concentrating so hard he didnt even notice. You would be forgiven for thinking he was reading an important email, but no - he was playing Candy Crush.