There are few things as intrinsic in the fabric of Japanese culture as a bento (弁当) べんとう box.
My little one, just shy of two years old, went to his first day of school last week. My wife got up extra early to make a box lunch for both him and his brother. Here's his first bento, pictured.
Let's get into the history and etymology some other time. For now, just enjoy the little onigiri (rice balls) smiling up at you. I know my little guy sure did when he opened his lunch box at school.