This is a wastebin in the Tim Hortons at the corner of Hammonds Plains Road and Bedford Highway. They are a location that has both a Cold Stone Creamery and a drive-thru window, and the building was originally built for neither, so they are a little tight on space. Apparently this compact square wastebin was part of the solution.
The problem is, it's impossible to tell which slot is for what. In the two images above I show two equally plausible interpretations for what's supposed to go where. Having shaped slots is a nice idea, and they have the potential to remove the equivocation, but the images above the slots don't show the corresponding shapes.
Inevitably I stand there for a few moments looking confused, and inevitably an employee at the counter pipes up and tells me which one. Sometimes they or fellow patrons have a little chuckle at my expense. I can't even tell what goes where by what's in the bins because I'm both 1) not the only person confused 2) one of only some who are conscientious enough to care.
I'd change this design by making the shapes meaningful though having them shown in the photos. Labels would work too, but then you'd have to have something printed next to the slot that could get kind of messy and / or worn out. Shaped slots are more elegant.