When starting a new project, I need focus and attention to plan ahead the next great product, it makes sense to focus and enclose yourself inside a bubble, disconnecting from the outside world and just focus on the road ahead, not letting the voice of others and the real world distract you.
Use the biggest space you can find, preferably no at your office desk. Doing so at your own office will subdue you to external interrupts - get out of your office box!
Each sticky note is used to hold one idea, sorting and moving them is much easier than writing them on the white board as you might shift your thinking or decide go to group them differently then you have originally thought. Using the white board do not allow your thinking to be truly free.
Each column is a group of things or ideas worthwhile exploring. Moving an idea or an action from one group to the other will free your mind from the hassle of erasing and re-writing.