Also know, that it is as possible to see the winde as the aire, their substances being too tenuous to be perceived; unlesse in a storm-winde, whose matter is an exhalation so thick that it darkens the aire:

Hefner gives an illustration of tegulated armour (Fig. 90) from a painting on vellum dating from c. 1090, when this system appears to have been introduced.

Transient luminous events can be another source of ionization in the upper atmosphere.

To define attribute classes and reflect on them at runtime, you have to consider a few more issues.