The smokestack of the local power plant in Turku, Finland, bears the first ten numbers of the Fibonacci sequence in glowing letters seven feet high.
The artist, Mario Merz, had been obsessed with the sequence for nearly 30 years when he added the numbers in 1995; he’d already added them to a chapel in Paris and a spire in Turin.

It was the first commission of the Turku City Environmental Art Project in 1994. The artist, Mario Merz (Italy) calls it Fibonacci Sequence 1-55 and says "it is a metaphor of the human quest for order and harmony among chaos."

Architectural design using the Golden Ratio or Fibonacci numbers was prevalent in Renaissance art and architecture. The first nine numbers of the Fibonacci sequence, 1, 2, 3, 5, 8, 13, 21, 34 and 55, denote the radii of the various circles in the design. It also appears in nature. For example, in the perfect wave...
Forever Carlsbad.
"Even though I am not a Californian, I hope the Carlsbad CA, smokestack stays, for it is an iconic historical landmark, for Carlsbad CA, and it can be seen from sea, land, and air. It is also a testimony to the past, of the hard work, that past generations built, in American architecture heritage. We cannot lose old architecture heritage, for future unborn generations, need to see, what America has built, in the past, whether it be cars, houses, that smokestack, and so on. As a West Texan, who proudly lives in Carlsbad, Texas, our smokestack (which is a smaller smokestack, leveling out at 110 to 130 ft) has been in place, since the 1920s at the San Angelo State Supported Living Center, mental health facility, in Carlsbad, Texas. Our stack is an icon, and when I see our smokestack from Hwy 87, or from the sky, I know home is close by, and that is a good feeling. Keep fighting for your/our American architecture heritage."
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Sincerely/Respectfully, JD
Carlsbad, Texas