 Why did Humphrey decorate with a moon, neon roses, and music?
In the ensuing contretemps they emptied his rear pants pockets, got his wristwatch and restored the contents of the handkerchief pocket. It was precipitation peculiar to a dome: feather-light fragments showering harmlessly on the city from time to time. It was this rather than skill that enabled the police to maintain such a tight surveillance on him, a surveillance that went to the extent of getting his fingerprints off the postman's bag, and which photographed, X-rayed and chemically analyzed the contents of his pockets before returning them. Fownes stopped on the porch to brush the plaster of paris off his shoes. He watched as they spun and flashed in the darkness, and then set them for seven o'clock in the evening, April seventh, any year. Or, as Fownes hoped it might appear, the illusion of the domed city vanished and was replaced by a more satisfactory, and, for his specific purpose, more functional, illusion. Instead of an orange sun at perpetual high noon, there was a red sun setting brilliantly, marred only by an occasional arcover which left the smell of ozone in the air. The sun and moon both looked down upon a garden that was itself scintillant, composed largely of neon roses. He watched as the moon played, Oh, You Beautiful Doll and the neon roses flashed slowly from red to violet, then went back to the closet and turned on the scent. The house began to smell like an immensely concentrated rose as the moon shifted to People Will Say We're In Love .
 to seduce Mrs. Deshazaway
 to give Mrs. Deshazaway something that looked like her past  to seduce Mrs. Deshazaway  he was trying to decorate his home uniquely  these were items he had read about from the past