The painted red strip around the outside of Roman Buildings

[Iulia Cassia Vegetia]

But why they (hypothetically) painted the wall with a red band?

Thank's
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Mateo González Vázquez

LEGIO VIIII HISPANA

Because it's PRETTY
Just kidding. Actiually, the Romans used red a lot, and my guess (just a theory) is that red represents life force (blood) or protection, so perhaps the idea was not only to beautify the building, but to protect it from harm. Red is also the color of Mars, so possibly a connection there.