When the pyramid-shaped cap to the Gulf Tower first started giving a weather report, it was a binary prediction. Beginning in 1956, the pyramid atop the 44-story skyscraper would glow orange for fair weather, blue for foul — a practice that continued into the 1970s.

Revived in 2012 as a dynamic light sculpture, the modern forecast is a bit more complicated. The top three levels indicate the temperature; really red is really hot (80 degrees Fahrenheit or above), very blue is very cold (at or below 0) and the various shades between blue and red sit somewhere in between.

Moving down the pyramid from there, the colors convey the likelihood of rain (reddish purple indicates yes, bluish purple hints no), the humidity (dark green means above 50% humidity, light green means more comfortable) and

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