The Empty Lamp will randomly appear in your town. On a weekday at about 9:00 P.M, on the southern part of your town, a spirit named Wisp will appear, and say something like "Come Closer Please", and if you find the lamp somewhere in your town, he will tell you to go to your attic because he is uncomfortable in open places. When you go to your attic the lamp will be renamed "magic lamp". Once you go in your go to your attic, there will be the option to rub the lamp. Wisp will appear, and will allow you a choice of 3 wishes. You can ask Wisp to rid all the weeds from your town, which you will see the result of within the next few days, squash cockroaches that could appear in your bedroom (if you have to not played for at least a week or so), or ask Wisp for an item like furniture, clothes, etc. The item Wisp gives is often very common and can be purchased from the catalogue, so it is better to choose one of the other options.
Wisp is one of the only spirits that shows up in the game, along with the fountain spirit when you throw an axe into the fountain you gain when donating a certain sum of money into the town fund. Once you help Wisp a first time, he can appear again in search of his lamp. Once you see him a second time and every time after that, he will be even more embarrassed than he is the first time, saying that he knows it is ridiculous for him to repeatedly lose his lamp.