Old Bleu takes beautiful pieces of sustainable paulownia wood and hand crafts tide clocks for the lover of surf! These clocks are set according to our semidiurnal tide for the Atlantic Coast and will rotate every 12 hours and 25 minutes. In other areas, such as the Pacific Coast, the west coast of Florida, and the Gulf of Mexico, tides are diurnal or mixed, so this particular tide clock will need to be adjusted regularly in these locations. Stop in to see more colors and designs!