In the Middle Ages it was believed that one could tell the hour of day by observing flowers, which were believed to open and close at specific times. These would be planted in flower dials. The first hour belonged to the budding rose, the fourth to hyacinths and the twelfth to pansies. The unreliability of this method of timekeeping must have soon become apparent, but floral clocks are still planted in parks and gardens today. The world's largest clock face is that of the floral clock located inside the Rose Building in Hokkaido, Japan. The diameter of the clock is almost 69 feet (21 meters), and the large hand of the clock is almost 28 feet (8.5 meters) in length.
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