Prosperous wealth and common toad toad, respectively, is that it has only three legs instead of four.Legend has it that it was the demon, then right, spit of money to the people around, so, later by people as a prosperous wealth benevolent.Note put toad, head to inward, remember not to the outside.Doors and Windows are the same reason.Otherwise the money of vomit all spit out outside, not only can't push type, instead of leakage may be caused.