Architectonica Spiral

Commonly called the Sundial shell, Architectonica is small. The specimen shown in this photo is probably less than an inch across.

Sundial Seashell 1 by Harold Davis
Sundial Seashell 1 © Harold Davis

Turn the shell over, and there’s a tiny spiral formation going down into the core of the shell. This spiral looks like a staircase—but don’t forget how small it is. The version shown here is greatly magnified, probably twenty or thirty times life size.

Architectonica Spiral 1 by Harold Davis
Architectonica Spiral 1 © Harold Davis


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