Hopefully this is the right place to post:
I've been trying to help my mother declutter her house, primarily of the stuff my father left behind when he died nearly a decade ago. I recently found a good number of discs for Mac from pre-OS X. I unfortunately don't have any running old Macs anymore and have neither the time or space to do anything with them.
I hate tossing out anything that someone else could use and selling my dad's stuff makes me feel gross. If anyone is willing to cover shipping, I'd be more than happy to send them whatever Mac games I come across.
If they were using a polarizing filter on their lens, then the two targets would appear to have uniform brightness. What you're seeing isn't one target brighter than the other, it's a glare from the sun reflecting off the paper. Look at the far right of the right target and you'll see a similar brightness value.
Learn more about polarization in photography with some similar examples.