I think this text message from my daughter pretty much sums it up:
"The Apple ads at North/Clybourn are intensely irritating. I think you can see them from space."
As part of its $4 million dollar deal with the CTA to fix up the North/Clybourn station, Apple got exclusive advertising rights. So all you North/Clybourn commuters, you'll be shielding your eyes from these light boxes for some time to come.