Words and images go together like to halves of a whole, the peanut butter and the jelly. Without one the other doesn’t convey the message as well. Sure you can have a page with just words or a page with just a picture, but do you really know what it means? For the human mind and eye it is so much easier to understand the concept of something when you put them together. Take this picture for instance:
If you look at the left side you see just a black word on plain white paper. You may know the meaning of the word but what does it really mean. When you see something in that form you have to ask yourself many questions. What does the word fun pertain to in this sense? What is fun? Why is it fun? You cant figure it out, because there is no picture or image to tell you what it is. But the combination of the two put together is what gives you the image of unity. It helps the human mind better understand what it is seeing. That’s why when you look on the right of the image you now understand what the fun is because you associated it with a picture. Now it is self-explanatory and you can answer all of your own questions.