Water
Yup, three states of matter. Three distinctly different materials with different properties. Still, it is all H2O.
Möbius strip
From The Mathematical Tourist:
Designed in 1965 by artist José de Rivera (1904-1985), who titled the piece Infinity, the looped sculpture is based on a mathematical figure known as the Möbius strip. A Möbius strip has just one side and one continuous edge. You can make a model of a Möbius strip by joining the two ends of a strip of paper after giving one end a 180-degree twist.
De Rivera's sculpture is a three-dimensional analog of the usual twisted, rectangular strip. The loop's cross section is an equilateral triangle, and this triangle rotates through 120 degrees before the ends meet to form a complete loop. Instead of three surfaces, the final result has just one continuous surface that runs three times around the loop.
I find it ironic that this sculptural expression of the Christian concept of Trinity is displayed atop a black granite pillar in front of the National Museum of American History in Washington, D.C. I guess you can get away with religious art if you give it an abstract name like "Infinity".
Well done sir, those are excellent examples! And I don't think .gov knows the deeper meaning of Infinity, otherwise it'd be gone!
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