With the elements in this design and some terracotta pots, you can create a water reservoir for Birds that does not freeze in winter. Birds love it when it's cold, even though there is enough snow around. The water is at about 5-10 degrees celcius (40-50 F) when it's -10 to -5 degrees celsius outside (15-15 F). It's wind proof and air can circulate through, so a typical graveyard candle burns 3 days inside.