If you’ve ever seen artifacts on a digital picture of a computer monitor, or noticed an unsettling shifting pattern on a TV displaying someone’s clothes which have stripes, you’ve seen what ...

A concise, comical explanation of Moiré patterns, via XKCD. Moiré patterns are interference patterns created when grids of different size or alignment are placed over each other. You’ve ...

1 Coarse grating No. 2 Fine grating No. 3 Logarithmic grating No. 4 Radiating lines No. 5 Equispaced circles No. 6 Circular zone plate No. 7 Sphere projection No. 8 Cylinder projection 2 pieces of ...