These principles act in a gestalt, where the whole is more than the sum of its parts. That is, using all these principles together is more important and creates a greater effect than using only one principle.
Keep in mind that:
Contrast doesn’t mean everything is big—it means there is a contrast between elements, and its point is to provide clarity.
Repetition does not mean it all looks the same—it means you have created a consistent look that ties your slides together.
Alignment does not mean everything is aligned along one line—it means every item on the slide is visually connected to some other item, and elements across slides provide a consistent line for visual organization (which translates to an intellectual ...