The whole building of new house has bay windows. Before renovation, I saw decoration of neighbor's house. When new house was finished, master who installed bay window and countertop also made edges of two ears. I was very curious and I asked master. Explanation master really taught me a lot. It turns out that these two "ears" are so useful. Does your family swim? Are windows like that?
This is an extra lug when installing a bay window top. In fact, this is not only a bay window. Based on this explanation, other windows should also be installed this way. When setting up countertop, responsible person will leave such ears for himself, not only for beauty, master said, they are more practical for bay windows.
Why do you say that? If it suddenly starts raining and you don't have time to close doors and windows, rain will accidentally swim in. If there is no pair of ears, rain will accumulate on windowsill, or penetrate window frame, or damage skin of wall by window. If it is wallpaper, it will also be wet.
Due to an extra pair of ears, water on bay table will drain to ground along path, and wall will not be damp and will not accumulate on bay table. The windows are all closed with wood, so they are more afraid of moisture.
Most walls now contain limestone, which will quickly turn greyish-black when exposed to water, which will affect load-bearing capacity of entire wall, so it is necessary to install such an ear pattern on bay window.
Installation of bay windows is actually very competent. I saw a man who said that holes are drilled in bay windows and water will flow out. I've never seen how it's done, and I don't know principle." Ear" is very practical, go and check if your house is decorated?