Interference Effects
moire [moiré] n. an independent usually shimmering pattern seen when two geometrically regular patterns (such as two sets of parallel lines or two halftone screens) are superimposed especially at an acute angle. Merriam-Webster
In Photoshop I’ve been able to play with interference effects — you may know them as moire patterns. Because you see them on a pixel-grid screen your eyes may register differences in a moire pattern shown at several sizes. I assume this is because the grids interfere with each other.
In the illustration below you see two sets of parallel lines of dots being offset to produce a moire pattern. I like how they combine, work with Photoshop’s layer effects, contrast with non-moire art effects in the same artwork.

Copyright-free image from free-images.com, via Wikipedia
Last image, The Cove, uses a riot of snipped-up interference patterns to convey choppy waters.
I’m a big fan of any kind of distortion. I once made a recording of small handmade glass balls being rolled inside a hubcap. Then I slowed it to the maximum my software allowed. I can fall blissfully into the spell of that recording still.
Inward with the Droste Spiral
Playground Layered Shapes
Using Photoshop Paintbucket Tool and Patterns
to Make Abstractions from Photos
LuxDraw by Norbyte
Including a Motif
Blue Light
The App Girih
Tile Photos FX, puzzle-cut mode
The App Scale: Beautiful Fractals
Torso Incognito
3-D Materials
Photoshop Grids
Cutting Up Art with the App Tiles FX
Motion 03: More Complex
Motion 02: Stacked Math Movies
Motion 01: Visual Math and Video Dance
Interference Effects
Years of Tries at 3D Effects
Squiggles with Patterns
3d Models as Paint Brushes, Plus Glazes
3 Images from 1 Source
Compound Eye from ImageTricks
Silhouettes
AutoType Writing