What is illusion?
A legend tells how once student said to master ,master, show me illusion." a few days passed away and master asked student to make a trip with him towards a desert,and after walking for several miles ,master said student i am thirsty can you fetch some water for me? i will go at once master and get some water for you ,now student go in search of water ,at a little distance there was a town he enter into it at a house he knocked at the door ,that was opened by beautiful young girl .at a time of her he essaly forgot that his master was waiting for water,perhaps dying for the want of it.he forgot everything and began to talk.all that day he did not return to his master. the next day,he was again at the house talking to the girl.and he fell into her love,he asked the father for the daughter and they were married and lived there and had children .once a day came a flood .river flooded the whole town .student had to escape .with one hand be held his wife and with the other two of his children ,a cry of despair came from student .he lost his wife and children behind him there came a voice "my child where is the water?you went to fetch a pitcher of water and i am for you:you have been gone for quite half an hour.half an hour !student exclaimed .twelve whole years had passed through his mind and all these scenes had happened in half an hour!and this is illusion.