What's so particular about Feng Shui in curtain case?

Now there are many trendy and unusual patterns on the curtains, which may cater to the preferences of young people, but they are unlucky in geomantic omen. For example, skeletons that are common in the market now, and dolls with strange or fierce shapes, consumers had better not choose to buy these patterns, so as not to have a bad influence on people. In particular, it can not be installed in the elderly room or children's room, which will bring them a shadow.