Memento mori — remember you will die. The classical vanitas still life: flowers wilt, candles gutter, skulls watch. All beauty fades.
Watch the arrangement decay. Click to light a new candle, but it too will burn down. Time passes whether you're watching or not.
Low drone with occasional chimes. The sound of time passing. Fire crackles softly. When a flower wilts, a faint tone fades with it.