Do not use too much black color.
Another common mistake of the modern interior design is a lot of black color is used. Black color is a very popular color nowadays as many say it look arrogant and classical. However, black is yin energy and balancing is key in everything especially in feng shui perspective. If too much of black color is used, then too much of yin energy will be created in a building.
Also, black color is water element. Same concept applied as what mentioned above. If the occupants of the house’s bazi do not require water element then too much water is bad for them.
Toilet is dirty and it has lot of dirty qi, hence it is bad to sleep facing the door of the toilet. It will affect the health of the occupants if they spend too much time facing the toilet， when they sleep on the bed that faces the toilet. Nowadays, there are even toilets that designed with glasses, which cannot block the dirty qi from hitting the persons that sleep there.
厕所很脏，脏气很多，因此面对厕所门睡觉不好， 这会影响到住户的健康，如果他们睡在面对厕所的床上，而且花太多时间面对厕所健康将会受影响。 现在，甚至还有用玻璃设计的厕所，这完全不能阻止肮脏的气体冲击到睡在那里的人。
Bad Toilet Design with glasses.
Last but not least, but in fact is the most important error made in the modern design is a lot windows like to be used in building design especially those buildings that face the beautiful sea or river. Balancing is key in everything especially in feng shui perspective. If too much or too less of anything is bad. For instance eating too less, you will not have enough energy to work but if you eat too full or too much then is bad for health either. If there is too much of yang energy, then you will not be able to rest well and may cause mental tension.
Do you realize mental failure is a serious illness nowadays especially in busy cities like New York, Hong Kong, Tokyo, Shanghai or Seoul? It is because people like to build tall buildings with lots of windows to see the unblocked scenery of beautiful sea or rivers. Therefore, no doubt, then too much of yang energy will be created in a building. Human being need to live balancing in between active and passive, which is work actively, and rest peacefully. If there is too much of yang energy then you will not be able to rest well. Thus, you will have problem like insomnia or mental failure if it continues persistently.
I have noticed coffee café was built with all glasses and when the sun shines into the building, it is so warm and uncomfortable and the owner of the café has to put up blind to block the Sun. It makes the customers cannot see the inside of the café and wonder what shop is that.
Too many glasses or windows are not suitable as building design in countries which is located in warm tropical countries like Malaysia and Singapore.
Buildings with lots of unblocked big glasses or windows is bad even it looks grand and arrogant.