Does this material exist?

I think it would be swell to have a sphere made of a clear, solid material that had the refractive index of air, because it would essentially be invisible. Is there anything even close to this?
 
The closest I think you are going to get is Aerogel, which can have a index of refraction as low as 1.1 (air is ~1).
 
It's not quite clear, but that almost makes it cooler. Good thinking!
 

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