When I was small, once, I had a memory of an horrible, but impossible event, but I was not sure if it was a dream or not. It happened in real life according to my memory, but it was not possible. I used to think,’What if the things we see, hear, touch, feel...are all not real? What if they are just illusions?’ I thought I was the only one who have this question, and soon forgot about it.

When I grow up, I realise that I am not alone. ‘Reality’ have raisen the interest of thousand of our ancestors, philosophers, scientist… Therefore, I have the courage to write this story which was in my mind since I was small.