They sure do have, may be thats why they say,

“A Picture is Worth a Thousand Words”

“A good sketch is better than a long speech”

I am sure we all have always experienced that use of pictures/visuals turns out to be more effective than text or speech, sometimes they make you understand most difficult things very easily.

Most of the time, I have found that pictures are self explanatory, not needing any words to explain the meaning. But there are times when it becomes very difficult to decode the message the picture is trying to convey and even the message may very depending on the user perception which means there could be multiple interpretations of the same picture and the fun part is all of them seem to be true!