Incense
"The burning of an incense stick - resulting in fragrant smoke - teaches the necessity to burn away negative qualities within oneself in order to reveal the pure self within."
I found it a bit ironic that something meant to reveal the "pure self within" was dirtying the inside of this worship room so much that the once red-brick inner walls are now blackened with smoke residue. But I have to admit, though a bit hazy inside, the scent was very relaxing and created an ironically bright atmosphere. Maybe there's something to incense burning after all...