Principals of Design 3 of 7
The size and weight of different elements of your design and how they relate to each other.
Lets look at another poster. The most important information here is 'Adult and Children's karate classes" Its the biggest text and its right in the middle. The benefits and class information are given fairly equal priority in terms of font size, but by placing the class information in the red panel, that, becomes the second point you read.
You will notice that although the poster is not divided into equal thirds the text areas are of a similar proportion, adding to the overall balance of the design.