If a person wishes to conceal what they've seen, to cover up the message that lies before their eyes.
It seems difficult, on the surface, to solve this predicament through conventional methods.
Because people need to make a clear judgement about what lies before them.
However, in reality, once the key and core of the problem are found, all problems before one's eyes are no longer problems.
At least, that's the case when it looks like everything is as it appears on the surface.
Consequently, in such circumstances, all one needs to do is identify the person they truly wish to deceive.
Even if it is something conspicuous, right before one's eyes.
People could easily overlook it, driven by a singular, deliberate intention.
Therefore, naturally, under such circumstances, there is seldom need for further hesitation.
Moreover, the answer to this problem inevitably lies at its core.
Gradually, it becomes glaringly obvious.