Real moiré patterns are optical illusions created when similar pattern grids or lines are laid over each other. They create a sense of motion, sometime dizzyingly, and are very, very active in terms of feng shui energy. Authentic moiré patterns can happen in a home when two fairly fine mesh screens are placed one behind the other and a few inches apart. (You’ll also often see them when you take a photo or video of a computer monitor or television screen.)
 Here’s an animation of a moving moiré pattern. By P. Fraundorf, CC BY-SA 3.0. Wikimedia Commons. |
 Both the pattern and the color say “water”. This lovely fabric from Oleandro Creations would be perfect in the Career Area, as well as the Wealth and Health/Family Areas. |
There is an artificial moiré that is sometimes woven into damask fabric to make drapes or upholstery. The artificial, cloth moiré is never a problem, and can look quite elegant in silk. This article is about real moiré, which is far too active for use in most home situations.
If you have time and/or inclination, Mr. Wizard has a very good explanation and several examples, and he even shows a sample of moiré fabric to start.
Our house has a lot of screen walls, but thankfully very few moire patterns. Here’s a place where two screen walls meet at a right angle, and there’s that moire (down in the bottom corner)! It’s pleasant because it’s seldom noticed.
A client on Oahu lived in a home on a ridge overlooking the Diamond Head area and had some nice views out of the living room windows. She had recently bought window treatments and had wanted to keep some of the view by using some pull down shades with lots of holes in them. When this combined with the insect screen on the window the effect was huge moving moiré patterns every time you moved in that room (during daylight hours—a moiré like that wouldn’t show up when there’s dark on the other side of the window).
The custom-made shades had cost her a lot of money, but living with them pulled down was driving her crazy. I totally understood the problem and frankly said that I couldn’t live with that in my own home. I’m appalled that the shades salesperson who visited her home for measurements didn’t warn her about the patterns.
What could I say, except, “Don’t use them”? I hate saying that when somebody just made a large capital outlay on something that turns out wrong, but anything that is driving you crazy in your own home is not good feng shui! I felt like a jerk saying, “Don’t use them,” but I spoke honestly.
Source: Houzz
An occasional, mild, moving moiré pattern in your home is not a problem. But my Oahu client had several big windows in her living room, and even if you moved very slightly, the moiré pattern would show up as a very active thing in your view. That is pointless visual noise and it can drive a person crazy—especially if there’s a lot of it.
Those large, shiny kinetic wind sculptures some people like to hang in their gardens have a similar effect—the slightest breeze causes endless waves of motion; there’s always something vibrating and hovering at the edge of your field of view. That sort of constant visual noise should be avoided for a peaceful home.
Clear Englebert's Feng Shui Blog 