Whenever you visit Seoul, normally you cannot see lot' s of house expressing traditional beauty. I found one place expressing the traditional beauty, where Crown Price Sado died, Changgyeung Palace. The first scientific knowldege I gained was the bumpy stones.There are 3 reasons why.

Firstly, it was to refelct the how sunlight to keep the officers cool in hot summer, and also, the officers' shoes were made of leather, which had a flat bottom, so this was falling proof. And also in the rainy days, it was slippery so this was falling proof, too.

Secondly, the knowledge I gained is japsang, which people believed they blocked the palace from burning down by blocking the fire spirit. Thank You for your attention.