Definition: Oculus, Perfect Number, Rotunda, Scoria, Porphyry, Groundmass, Aphanitic

THE PERFECT number… and some architectural features found in the Pantheon.



A round or eye-like opening or design


Perfect number

A whole number whose summed factors equal it (6,28,496,8128)



Any building with a circular ground plan, and sometimes covered by a dome



A low-density, lightweight volcanic rock



The compact, finer-grained material in which the crystals are embedded in a porphyritic rock (groundmass also called matrix)



Fine grained



An igneous rock consisting of large-grained crystals such as feldspar or quartz dispersed in a fine-grained silicate rich, generally aphanitic matrix or groundmass


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.