Is there anything different in how the two plugs are built?<p>Is there any difference in how our left and right ear works?<p>I find that due to my obsessive compulsiveness, I waste a few seconds every time I use them in making sure that I am putting them on correctly!<p>EDIT: In addition, does it have an effect on your hearing experience if you put the left ear plug in your right ear and vice versa? If not, then why bother marking them?