Perhaps we have different interpretations of the word 'unique'. Having the team's logo on the side of the stadium (hence the bullhorns) I would think is common but if you are saying that because the bullhorns are not on every stadium then that makes it unique...I guess you are sort of right? If you think the Heptagon shape is somehow special, I honestly don't know what to tell you. I suppose its unique in the sense that midgets are short? To be clear, it's a lovely looking stadium. It is just simply not unique.