Well, I'm not sure. Sometimes I would be standing next to a box, hold left click, and the box that gets attract i the box off screen instead of the one next to me. Some levels involve putting a box with normal gravity on an upside down button and the way I did it was I attracted the box, touched the box causing it to freeze, and finally shoved the box onto the button, which feels pretty weird and would be magnitudes harder when there are multiple boxes.