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do light waves travel only in a linear direction?
do we only see objects because of the light reflecting off of the material? what about the "party" lights (the big ones that shine into the sky that can be seen for miles). does the light have to be reflected off of colloids in the air in order for us to see the light? Otherwise, wouldn't the light beam just travel in a straight trajectory, unseen? If there were no colloids in the air, would we be able to see that light, unless it were directed straight at us?