Here are just a few examples of Bubble charts created using Chartz

The bubble chart is like a point chart except that the size of the bubbles are an element of the dataset. Here the default "Color each" coloring is shown for a single data set. A click of the Refresh button will provide an entirely new color arrangement.
A bubble gradient, in this case with a direction "From center", yields a 3D effect.
While transparency is useful when bubble overlap.
The bubble chart on the left is actually a background JPG image exported from a previously designed chart.
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