Why does Prospero decorate the rooms like he does in "The Masque of the Red Death"?

Poe's seven chambers in "Masque of the Red Death" symbolize the stages of life.  The first room is blue and is located in the east.  The sun rises in the east, signifying the birth of each new day as well as the birth of man.  Blue is a calming color that symbolizes the serene life of infancy.  The next room, purple, is a deepening of the blue hue mixed with the red of experience... this is childhood when the baby gains some experiences in life (learning to walk, talk, how to relate to the world around him).  As the child grows, the third (green) room could symbolize youth.  The child begins school, and his world experience grows and blooms.  The fourth room is the orange of angry adolescence.  The fifth is white, symbolizing new beginnnings as the adolescent begins his own life as an adult.  A wedding is a new beginning, and the bride traditionally wears white.  After the white room is the violet room, or a return to childlike ways in retirement and old age.  Retired people remember what it is to "play" now that they have earned the right after years of work.  At some point in old age, the person must be cared for much like he had been during his first visit to a purple room in childhood.  The final room (located in the west) is black, symbolizing death.  The clock in this room marks the passage of time, and its chimes can be heard in all the rooms, even in the east. This shows that death is ever present.