Orbis Writings

There’s a few novels I’ve read so far where the author uses the action of waving when someone points to something.  For example:

Julia was looking for her shoes.  She asked Marc who in turn waved at the bag on the floor.

The above wasn’t taken from a novel, but is pretty close to what I have read.  My problem with this is that it’s vague and right away I either think Marc is waving at it like it’s a cruise ship or like he’s presenting a prize on The Price is Right.

There must be a better way to write these kinds of narrative.