The history behind the festival is complex, and Thais celebrate for many reasons. The main rice harvest season has ended and it’s time to thank the Water Goddess for a year’s worth of her abundant supply, as well as an apology for polluting the waters. Some believe that this is the time to symbolically ‘float away’ all the anger and grudges you have been holding onto, and including a fingernail or a lock of hair is seen as a way of letting go of the dark side of yourself, to start anew free of negative feelings. If your candle stays alight until your Krathong disappears out of sight, it means a year of good luck.