Blind swimmer Enhamed Enhamed has been hailed as the Michael Phelps of the Paralympic Games.
The Spaniard, who lost his sight after suffering a retinal detachment, won four golds at the 2008 Games in Beijing and is set to defend those titles in London.
Here, the 24-year-old Paralympian tells BBC Mundo's Rosario Gabino about losing his sight as a youngster and how his blindness helped him become a world-class athlete.
Enhamed: "I was born in Palmas de Gran Canaria in Spain in 1987 and I 'won my blindness' when I was eight. That's when I learnt how to swim.
I always say that I 'won my blindness' because in this life we lose so many things.
Since I became blind - since I won my blindness - my life has changed drastically.
This blindness has given me so much. I've learnt so much that I prefer to say I've won it.
I consider myself to be a very fortunate person. I wouldn't be competing at London 2012 if I wasn't blind.
I remember many images. I remember rainy days. And cloudy days, in particular. The day I won my blindness it was cloudy.
And colours, many colours.
When I was eight, I was told I couldn't jump, or run, or play, because a sudden movement meant I could go blind.
But when you're a child, you don't care.
One day I was running around the house and my mother said: 'Stay still, or you know what is going to happen.'
So I lay down.
When I raised my head five seconds later, I went from seeing to not seeing anything at all.
Water means freedom to me.
That's where I move with ease, where I become myself, where I can go as fast as I want without hearing the words: 'Be careful, you're going to crash.' They actually tell me: 'Come on, you can go faster.'
My favourite style is butterfly. There is a brief moment when you throw your arms in front of you that you are almost above the water.
It feels like flying.
Words such as 'effort' or 'self-improvement' have become meaningless. For me, what is clear is that today we have to do a little bit more, go a little bit further than we did yesterday.
You have to advance and to move in order to enjoy the life you have because soon this day will be gone."