The word greenness is mentioned several times in the verses of the Quran; describing the state of the inhabitants of paradise, and what surrounds them of blessings in a luxury atmosphere of happiness, amusement and reassurance.
For instance :
Allah says in the holly Quran : (Reclining on green Cushions and rich Carpets of beauty) (SURAH AL RAHMAN:76).
Allah says in the holly Quran: ( Upon them will be green Garments of fine silk and heavy brocade, and they will be adorned with bracelets of silver; and their Lord will give to them to drink of a Wine Pure and Holy) (SURAH AL INSAN:21)
Allah says in the holly Quran :( They will recline on Carpets, whose inner linings will be of rich brocade: the Fruit of the Gardens will be near (and easy of reach)) (SURAH AL RAHMAN:54).
A psychologist called:
Ardtcham stated that colours exert a marked influence on humans. In order to prove this idea a number of experiments have been conducted, demonstrating how colours affect our enthusiasm and wariness, it also gives a cold or warm feeling, brings happiness and sadness and have an impact on our personality and the way we see life.
Nowadays hospitals weigh up the role colours play in changing the inner of human beings, by taking into account the specialists suggestions about the colours that should be used inside hospitals for the walls and clothing.
Trials have indicated the stimulation of the nervous system by the yellow colour. The orange brings reassurance and calm, The blue makes people feel cold unlike the red which makes them feel warm. However, it was found that the colour of joy and happiness is the green, which makes it the favourite colour for surgical rooms and surgeon’s uniform.
One example concerning this tremendous effects colours have, comes to our minds, concerning the experiment that was carried in a London bridge called “black friar” known as the suicide bridge, as many of the suicides were committed from it. When its colour was changed from grey to a nice green colour the rate of suicide has declined enormously.
It is known that the green colour eases the vision due to its small vision area in addition to its medium wave length which is shorter than the red one and longer that the blue one.
References : "With medicine in the Quran" Dr Abd Alhalim Diab. Dr Ahmed Karkouz. Association of the Quran sciences. Damascus