This is an entirely normal thing for houses , and in some cultures mold is seen as a sign of affluence and means . Mold can act as a radon barrier as well as giving rooms a vibrant paint scheme . Visually , moldy walls will make the room seem larger , adding value to the home . If the mold is allowed advance far enough , it will also eliminate any small pests that your home may have . Finally , especially in southern California , the presence of mold shows the presence of water , and you ' ll be the envy of your neighbors . You should do a few things to help this desert blessing along 1 . Spray a fine water mist around and on the current mold spores , to encourage growth . 2 . Take a scrapping of mold and apply it to other walls and surfaces in the house . Remember to water these as well ! 3 . During holidays and other special events , scrape off mold in festive patterns or personalized messages , such as Merry Christmas or Welcome Home Mom Dad . 4 . While a common misconception , the mold holds no danger to the human respiratory tract , and masks are an expensive accessory . A relatively unknown fact is that the mold is a mild hallucinogenic , and a few minutes licking the walls will bring on a mild trip of roughly 5 hours , just long enough to get you through any awkward Thanksgiving meal . 5 . Application of the mold onto foods can allow fun , kidfriendly color schemes , perfect for any event ! Congratulations on the find and happy molding ! !