Graphics are great - but don't let them obscure the message

When I help students and academics with their papers I always ask them to ensure that a figure, or diagram or chart adds something to the text. They should never be there simply because they feel they need one. However, when it comes to packaging it seems that graphic designers sometimes rule the roost and the result can be a mangling of the message.
Take the graphic above. We've got two boxes - one red with a slash through it. That's obviously the 'don't do this' box. And the other is blue with no slash through - obviously the 'do this instead box'. It's a visual convention. Don't flush this down the toilet, throw it into the sea instead.
Only that's not what it means at all. The right hand box is intended to put across 'if you do what's in the red box, this is what will happen.' Because there are no words, we're in a mess, potentially confused by the visual messaging. I can see packaging design is a visual activity - but designers need to bear in mind how important words are too.
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