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Ensuring that control structures don't share lines with the content they define is important. Lines are the "boxes" or categories into which related syntax goes. In the case of a code block, all the syntax related to a given statement goes on the same line. This not only helps visual comprehension, but ensures that line-wise operations (user inputs like a triple-click or middle button click to select a line, delete a line, cut a line, duplicate a line, etc.) remain meaningful and effective. See More
The K&R style uses braces only when necessary. So for example: if(condition)
doSomething(); But this can be annoying if you need to put something inside that if statement, because you have to go and add braces to make sure that will be grouped correctly with the statement that was before. See More
Symmetry in size is important because it provides a visual cue that two things are similar in effect/importance. For example, in written text, lines of a paragraph are the same space apart. The space between paragraphs is larger, but also the same between each. The space between subsections, sections and chapters are progressively larger still. The space between things indicates their relatedness, and helps the reader to implicitly grasp the relationships between elements in the document. See More
With this style, one of the advantages is that the opening brace does not take a whole line for itself, wasting a lot of space. The closing brace though is indented on the same level as the control statement it belongs to, making it easier to understand which block of code it's closing. See More