I think that Second life is different from other virtual worlds because one it is more realistic. Most virtual worlds are not realistic but some are. Yes it makes second life more lifelike because it is realistic. You perform activities that are done in daily life. I think that it has less possibility space because it is so realistic and life like. In video games its more or less made up, some is real, but you have more of an opportunity to broaden your horizons or expand the game through creativity.