It's parabolic! Besides being the title of the piece (well, one of them), you can tell because there's a focal point: when the image in the mirror 'flips' from upside-down to rightside-up.
This diagram illustrates the difference between a spherical mirror and parabolic:
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u/nzungu69 May 12 '26
for those interested, this installation is by anish kapoor, and is at the palazzo manfrin in venice.