This scene consists of a huge sphere. A selfmade HDRI lits this minimalistic scene. If size, colour, diffusion and transparency of the sphere are set right, you can notice sinewave interferences created by the interaction of the sphere and the HDRI if rendered as 360 deg panorama. David found some weird things a while ago and I've investigated this a bit. To get the colours right, I had to tilt and rotate the HDRI in tenth of a degree steps. Stranger even, I get these colours only if I use Quality 64 - in all other Q settings, the colours are the same but completely different than here.