In Russia and many European countries the dance floors are raked. Which means they are set at and angle so that the audience is able to see everyone on stage, even if they are in the back. My studio is the least raked out of all the studios. And the stage is about twice as angled! It's taken some getting used to but I no longer feel like I'm going fall and roll down the floor!

 You can see the angle by looking at the ceiling and the barre...