They resemble us in many ways, though they are more spirit-like and invisible, and to see the elves, must to either be given permission by them, or have a special ability. They can have supra-human capacities; and they can be both better and worse than humans. To provoke their anger means trouble but to help them in times of crisis means blessings as a result they are powerful, respected and feared. The hidden people have various human attributes, and even though they live longer than we do, they are born and they die just as we do. They eat and drink, play instruments, have lights in their houses, go fishing, move residences, and keep animals, though they are more productive than those of humans.
http://en.wikipedia.org/wiki/HuldufÃ³lkHuldufÃ³lk (Icelandic hidden people from huldu- “pertaining to secrecy” and fÃ³lk “people”, “folk”) are elves in Icelandic folklore. Building projects in Iceland are sometimes altered to prevent damaging the rocks where they are believed to live.
There is a movie about the Huldufolk, but its not widely available...http://www.huldufolk102.com/trailer.html
http://www.huldufolk102.com/publicity.htmla particular stretch of road in Iceland was built to avoid a rock believed to house the hidden people. On one side sits a house, No. 100, on the other sits 104. The hidden people, naturally, live in 102.The people interviewed — teachers, MPs, historians, farmers, film directors, folklorists and more — are quite comfortable with the idea of a parallel universe
an elf house