What's the most important principle of visual design?

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To know most important principles of visual design, you need to think of it like a seesaw. Let me explain more; When both sides of a seesaw are equal, it's very stable and fun to play on, but if one side is too heavy, it's you’ll agree with me that it's going to so hard to balance and you might even fall.

So, In design, there need to ensure balance becuase it helps our eyes move smoothly around the page. When everything is balanced, it's so easy to look at and understand. What's your contribution?