Tourists who have delved into the mysteries of Bangkok a little too fully may wake up unable to remember what day of the week it is. Thankfully, they’ll never have trouble telling if it’s a Monday, thanks to the many yellow polo shirts they’ll encounter throughout the city. It’s not just a mass fashion statement, however. Under Buddhist cosmology, every day of the week is given a color. And Monday, whose color is yellow, was the day on which the King of Thailand was born. So to show their support of the beloved king, many Thais start the work week by donning their brightest yellow shirts.
