Here are some....items!
Yes it's a shelf & some hang cards of things. But what are these? They're all under the label of "Sonic Goods", likely at the Tokyo Joypolis somewhere. There are round items in bubble cards to the right, Sonic face rectangle items in the middle, flat (maybe pens?) in a basket & a square with a yellow background on the left.
Write in if you know what any of these things may be.