They’re both colours of nature. The skies and oceans are blue; the lands are green – it appeals to our natural instincts. The decor of hospitals are typically designed to calm people down and reduce anxiety.
The gowns however, depend on the hospital / country you are in. For example, where I am, Red means surgical, Green is Pharmacist, Light Blue is an Assistant, Blue means Nurse, Dark Blue is a Ward Manager, and Black is the Hospital Manager. But here, blue is the colour of the NHS.
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