What's the difference in argument in saying we can make a worship service "more special" by having candles (as in a candle lite xmas eve service), and we warrantably can make it special by using incense to make it smell "special"? I can understand if there is no electricity and candles become necessary, and likewise if there's a smelly situation where sweetening the air might be called for. But that isn't why these things are usually done, correct?