Sorry, I misunderstood you! I see the pink orb going around the circle just fine. I thought I was supposed to see a pink orb in the middle (on the crosshairs), the explanation ostensibly being that my eyes glance at the pink orb around the circumference when I see movement there and the persistence of vision is supposed to show me the orb in the middle when I go back to starting at it.

Apparently the illusion of the pink orb going around was so strong for me that I never stopped to think that was the illusion!

No wonder I thought I had missed where the creation of the circulating pink orb occured when I scanned the code! I feel a little silly now... (Oh and maybe still a bit weird from staring at the pattern!)