The Kleine Nete flows straight through the heart of Lier; the Grote Nete and a canal encircle the center. Along the riverside, willows bend over the water. Across the river stands the Zimmertoren, a 14th-century tower renamed for Louis Zimmer, who designed its astronomical clock with 11 faces in 1930. His studio, where 57 dials show the movements of the moon, the tides, the zodiac, and other cosmic phenomena, is inside the tower.
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