The Kanazawa Station Fountain Clock displays the time using controlled fountains of water. Located just outside the gate to the city's train station, it's more than just a clock - the valving that forms the clock's numeric digits is also used to spell out text messages in both Japanese and English. See photos and video here: [inventorspot.com].

More images: [www.google.com]

Here's a longer article about the clock: [news.softpedia.com].

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The photo below gives an idea of how the water jets form the characters.