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I don't think the Spherize filter will give you the effect you want if your circle is a solid colour. Think about what the Spherize filter is doing: it's re-arranging the pixels within a given area to give a 3D look, but if all the pixels are the same colour, you're not going to see any effect. You'll need to introduce some form of shading to get the look you're after.
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"It's just the way the operation made me"
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