Yes, the moiré effect is still used in various modern technologies today. One example is in the field of computer graphics and animation, where the effect is sometimes used to generate patterns and textures. Additionally, the moiré effect can occur in displays and imaging systems, such as in high-resolution displays that use a grid of pixels.

As for the observation of the moiré effect in ancient times, it is likely that people noticed the effect when looking through closely spaced lines, such as the fibers in a woven cloth or the branches of a tree. There is evidence that moiré patterns were created using weaving techniques in the Middle East as far back as the 11th century, and the phenomenon was studied by scientists and artists throughout history.

So, the moiré effect has been known for centuries, and it still continues to be used and studied today for its interesting and useful properties.
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