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The predominant shape for manhole covers has historically been round. This is primarily due to multiple engineering advantages. Round covers cannot fall into the hole, as their diameter remains constant regardless of angle—ensuring safety and functionality. However, the emergence of square manhole designs has brought forth an interesting debate on whether a shift towards such configurations could provide additional benefits.

As research into expanded grating technology continues, we are likely to see further advancements that capitalize on its unique properties. The integration of nanotechnology and materials science may lead to the development of even more sophisticated grating structures that can manipulate light in novel ways. This evolution will undoubtedly impact varied fields, from renewable energy to information technology, paving the way for more efficient systems and products.