Bells- call to prayer, represents followers concentration being freed from distractions and worries in life, used in a Buddhist temple to create a solemn, focused environment.
Incense- purifying oneself, represents the idea of reaching Nirvana.
Candles- acts as the light of Dharma in the darkness of ignorance.
Flowers- powerful reminders of beauty and impermanence. Fragrance is a reminder of compassionate service.