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In this image note the two figures (children?) dressed in blue between the two portions of the spina. They are ready to present the winner of the race with the prizes of a palm branch and a laurel wreath.
In the left rectangle note the obelisk and then the rack that holds seven "balls" and the blue man attending it. In the typical seven-lap race the balls were lowered to keep count of the laps. In the right rectangle of the spina there is a similar counting contraption. Also, in the right portion there are seven dolphins—I am not certain of their function. In the left rectangle there are also seven dolphins, but those are spewing water out of their mouths (click here to view).
This large second century Roman Mosaic that was discovered in Lugdunum (modern Lyon) in 1806. On it the details of a chariot race in the circus, or hippodrome, of Lugdunum is depicted. It is 16 feet long and 9 feet wide.
It is surrounded by a floral design, inside of which is a guilloche pattern, and inside of that the arena of the circus where 9 chariots are racing. No seating of the circus is represented and indeed the circus of Lugdunum originally had wooden seats that were destroyed by fire.