Lots of photons flying in circles around a black hole! @.@ Why is this even popular?		
				
			
							newtonian
							random
							pretty
							persistent
							photon
							rainbow
							orbit
							gravity
							filt
							bhol
					
	 
	
	
	
	Comments
		
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			Nice! This proves portal 2 is pretty good! 
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			You might have to reload when you open it for the first time. 
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			oh wait i figured it out 
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			how do you turn on newtonion gravity? 
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			thinking with portals-your doing it right