What are some surprising psychological hacks?

• Bird calls have a positive effect on mental tranquility.
• Green Color – Representing nature, this color can bring balance, harmony and relaxation to the home.
• Blue color - a color with an aesthetic quality. It creates a sense of calmness and brings relaxation, which is why this color is the best for the bedroom.
• Red color should be avoided as it quickens our breathing which increases heart-rate and blood pressure.
• Indoor plants reduce stress and increase happiness. How? = The basic fact that everyone knows is that trees take in carbon dioxide and release oxygen, which is our life force. Some trees help purify the air because they pull harmful chemicals from the air.