Short idea (6): The way humans are built we can not see the back of our heads directly, no matter what we do. We can get around this, if we want, by setting up a few mirrors or by asking others to look and tell us what they see. We also can't see the "back sides" of our own personalities. If we want to get around this we can look at our dreams (which reflect the sides of ourselves we can't see) or ask people how we look to them.
Points of View:
A person standing at one place who moves to another will find that things look different from each of the two places.
Two people standing at different places who are looking at the same thing will see the thing differently.
Longer observation (7): Science and Self-Knowledge: It is easy to have views about things, even strong views, even certainties, and to be wrong. Science does not guarantee truth, but the scientific method is an attempt to subject our views, even our certain views, to a slow and methodic and public scrutiny, filled with checks and safe-guards to try to filter out as many false views as possible.