Why are houses in Greece are blue and white ???

 Many people recognize blue and white as iconic colours of  Greece. These are also the colours in Greek flag.

Many of the Greek houses are built out of stone.  Rocky terrain is of darker colour.  

This presented a problem during the sunny Greek Summer.  The sunlight falling down on homes would be  absorbed by dark stones making interior unbearably hot.

Hence, residents began painting the stones white in order to cool down their interiors.

Greeks painted their house blue because it was  the cheapest colour available  !!!!