The way you look at things further limits how much of them you perceive or what aspect of them you perceive. For example, your values and beliefs can color what you notice in most any situation. The fact of the matter is, the only thing that's true about all homeless people is that they're all homeless. For all you know, they may be brilliant and hard-working, just having a tough go of it. The innermost circle is called retention or memory.
Memory is notoriously selective.
To prove this to yourself, sit down with some of your family members and take turns describing a situation from your past. Ask each person to describe their memory of the situation. Then notice how different each person's memories were. Your memory of what you were exposed to selects how much of it you really know. So we need better systems for learning what we already know, better systems for retaining and storing information so that we can recall it more efficiently.