Here is an examples of doors in the Art Deco style.
At the top is my base image. I created three 45-degree traingles and stacked them. By itself, that images reminds you of Art Deco, but isn't necessarily Art Deco.
The bottom example is Art Deco. Take element, reuse them, created layers of scale, from the tryptych to the tiny triangles formed by the eye. The lines that you see imply a zig-zag pattern. Your eye is drawn to the middle as that's the middle. It says, "Go through me." There lots of white space to soothe the eye. Together, the panels create an effect quite different from the single panel above.
Try rearranging the panels. With every other order, you'll find that the pattern breaks up and the results just aren't as pleasing.
I chose greens as my color to remind you that Art Deco comes in colors. It does. It really, really, does. Go look at the Emerald City in The Wizard of Oz. There's so much Art Deco that your arteries will implode.
Return to: Art Deco 101
Douglas Milewski is a fantasy writer who liked drafting class too much. In his recent artistic struggles to produce art deco for his own covers, he found no internet sites dedicated to the technical underpinnings of the art. Seeing a niche that needed filling, he has documented his hard learned experiences. He doesn't claim that he's right, and would very much appreciate it if someone more competent would save him from his own folly.