That's a great observation! You've probably noticed this around your city without giving it much thought. The truth is, both round and square trash bins are chosen for very specific reasons, and it's not just about aesthetics.
Round bins are incredibly common, especially on sidewalks and in parks. Their circular design serves a key purpose: traffic flow. With no sharp corners, they're easier to navigate around in crowded spaces, reducing bumps and scrapes for pedestrians. They're also often chosen for their capacity and stability; a cylindrical shape distributes weight evenly, making them harder to tip over. You'll frequently see these as standalone units.
Square or rectangular bins, on the other hand, are masters of fitting in. They are perfect for corners, against walls, or in recessed areas where maximizing space is crucial. Their flat sides allow them to be lined up neatly or placed flush against buildings. This shape is also practical for manufacturing and stacking during transport. In many cases, square designs are used for integrated systems, like bins built into bus shelters or public seating.
Ultimately, the choice comes down to function and location. Round bins excel in open, high-traffic areas for safety and capacity. Square bins solve spatial puzzles, fitting seamlessly into the urban landscape's nooks and crannies. So next time you toss something away, you'll know its shape is a small but thoughtful part of city design.