The chart on the left has an illusion of three-dimensionality, which misrepresents the data. The areas of the top (the actual pie chart) are distorted, and the segments in the front—Drizella, the Duchess, and especially the Countess—are magnified. The Countess has more visual importance than Cinderella, which is on the back, even though Cinderella danced with Prince Charming for longer (30% for Cinderella and 20% for the Countess).

On the right, a flat pie chart is a better representation of the actual numbers, making it easy for the viewers to compare the areas and notice that Cinderella spent more time dancing with Prince Charming than any other girl.