An immediate object is an object as it is represented by the sign, on the other hand, a dynamic object is an object as it is in reality, regardless of how the sign represents it.
Charles Peirce introduces this difference to the semiotic field. By introducing the difference between an Immediate and a Dynamic object Peirce strives to create a way for semioticians to represent what Peirce considers an indication of human knowledge – the inevitability of making an error (Fallibilism).
If one is to say that Aristotle is dead that would be a correct statement. That means that the object (or the circumstances) is represented in a sign that is correct. The correct sign contains Immediate and Dynamic objects that are the same. That is to say that both the object and the manner it is represented are the same. On the other hand, if the sign and the object, in reality, are different, the Immediate and the Dynamic objects will also differ.
Another aspect of the Peircian Dynamic object is that this object is a source of interpretation. This is to say that there is something that we could appeal to, in order for it to define whether our interpretations are reliable. Something that will say “Yes, I am!” in answer to one’s believes that the wall is not that hard or that a lake is not that deep.
Sadly, most often than not, we are not at all capable of distinguishing fast enough whether the Dynamic and the Immediate objects are different.