What is this close-up picture? (WotsThat: Window screen mesh)

Question

What object is shown in this zoomed-in close-up photo?

FlintstoneJr · Accepted Answer

Window screen mesh. The tiny holes in window screen mesh are precisely engineered to be small enough to block most insects while still allowing around 80% of light through, but here's the surprising part: the most common material isn't metal at all—it's actually fiberglass coated with vinyl, which is cheaper and less likely to corrode than traditional aluminum screens. This invention became standard in American homes only after World War II, when the technology became affordable enough for mass production.

Answer: Window screen mesh

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