FACIAL ANGLE: Another important alignment is the FACIAL ANGLE — the incline off the vertical at which both individual moldings and molding groups will be pitched. It's important to maintain a consistent facial angle throughout a molding sequence; otherwise the parts will appear disconnected because light will fall on them at unequal angles of incidence. At various times in classical design, we find facial angles anywhere from 30 to 60 degrees. Differing explanations have been offered for these variations, such as the sharp angle of the sun in the Mediterranean climate requiring a steeper pitch for proper shadow effect.
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[via Traditional Building Magazine]

{ 1 comment… read it below or add one }
My husband put some molding up but one part was shorter than the others so sat at a different angle. We didn’t initially think it would make any difference but it was so noticeable he had to try and find the proper molding again.