Dear all All the dasavatharams happened to prove the "development of organisms and the societal culture according to that". (Darwin copied the same and got the fame). First is the matsya avathar (the organism which can live only in water, at the time whole world was filled with water), next is Koorma avatar (the world has been splitted into water and land; subsequently the organisms also started to learnt according to the environment. The tortoise can live freely in both). Next is varaha (the boar can live only in land). Next is Narasimha (a wild animal with human impact). Next is Vamana (Short man) Might be the very ancient human beings as we saw them in the earthern pots. Coming to the story, this vamana brahmachari did not harmed or killed the king at all. He just send the king into the "Padhala loka" and he himself stood as the gate-keeper for his entrance even today according to myths. Though the king was very good in nature, he tortured devas inorder to prove his power. He was also a bit self-boasted fellow and he thought always about his self-power (Balam- hence called "mahabali"), which actually acts as a curtain to meet the god. Inorder to remove all his sins, lord came like this. Next is, he came as vamana while begging and while getting the alms, he was thrivikrama. What it actually means? This was the first viswaroopa darishanam showed by vishnu. 1. One should not weight the person before you by simply seeing him. 2. One should not give-up even if the problem grows upto the sky. If you think deeply, even at that time, you can find a solution. 3. Before providing the alms, think the background of the person. 4. Obey always your master's advise. 5. Even the god came infront of you and makes you to confuse to fulfill your wordings, you should not give up. All these things are the lessons from this avatar. From this avatar, a famous tamil proverb came into existence. "Kallanai nambinalum kullanai nambadhe" -- this actually means even if you believe shri krishna who always did mischeives we should not believe vamana, who came as a short man and turned to be the thrivikrama and thereby fooled mahabali. Pranams