What do you think when you see these pictures?

Have you seen the second picture's receptacle? What kind of receptacle do you use in your home? When I went to kindergarten, I used both in Korea; however, now most Koreans don't use the first photo's receptacle, for it is 110 volts' receptacle. If you go to a rural zone in Korea, you'll find a 110 volts' receptacles. Recently, 220 volts have been the main power voltage in Korea, for 220 volts' transfer efficiency is better than 110 volts' transfer efficiency. Now I use 110 volts' receptacle since I live in the United state. I think 110 volts is better than 220 volts because 220 volts is more dangerous than 110 volts.