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