Many times we seem to locate an object in our periphery, because our concentration is on what's directly in front of us, so it's not polluted by our expectations. One of the classic examples of this is the Ò€¦ As you're holding the weight up, there are a net two forces acting on the object (ignoring friction etc), both of which are in the vertical dimension:

Mind & brain Ò€ december 28, 2017 why you can miss things happening right in front of you itÒ€ℒs called change blindness, and you probably have it.