1) That's not an octagon. If anything, it's kind of a "barn" shape.
2) UFC rules prohibit any foreign objects like tables, chairs or miniature parking decks in the octagon.
3) When kids kept in the kiddie octagon can CLEARLY see their parents violently kicking something nearby, don't you think they'll try kicking each other?
4) How am I supposed to get a good look at your merch on the wall when I'm being distracted by toddlers kicking the shit out of each other in the throat?