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Glass Blocks are popular in construction as a way to allow light in, with an artistic flair.  They are often used in bathrooms and other areas which need both light and privacy.  Since they are strong they can be used as part of the structural detail with no need to frame them in. 

There is a bit of a disconnect in how this phrase is used.  A search for the phrase on Google will bring up contractors, builders and others who use glass building bocks.  A search for the phrase on Ebay will bring up all the auctions which have glass blocks incorporated into the products.  Usually that means Ebay will show you craft items that use glass in a block pattern.  I've listed those auctions below.