You can see the skin of the cactus is sort of like a diamond pattern.
These are hard to find and there is a guy who grows them in the Sonoran Desert and then he brings one or two each year to the Desert Botanical Garden to sell. I now have two in my yard.
The ends of the tips of the needles are yellow so at Sunset as the light catches the needles, it is very pretty.
Check out travel photos of the Como Duomo on Lake Como, Italy at Viva la Voyage!