The problem with images is that it is hard to overload them, but with sound, well you could if you want to. So if you want to get somebody attention, this is easier using sound
We get image intake almost continiously, so something can be overlooked because of the shear amount of infomration that we see
And we also are succeptable to our names, because clearly people need us when they call you by your name, right?
So all combined: Shout somebodys name as hard as you can and you will get their attention for sure
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