With you so far....
Based on what?
You already said that the same does not apply to thankfulness.
So why would it have to apply to appreciation?
So what is the problem?
Yes.
Because you have not revealed why your dad needing to know you are thankful is a requirement for you being thankful.
Again, until you can show that your being thankful is not valid unless the one you are thankful to/for knows it.....
Hi, I'm not sure how to use the quote function so I'll try to answer your points in summary.
It's not that my dad needs to know about me being thankful to him, for my thanks to be valid - it is that thanks, as with appreciation, is a relational act.
It requires a subject and an object.
If I direct thanks
to someone then they will know about it, of course.
If I give thanks
for someone, then there must be someone who can receive that thanks. This is the only way, logically, that we can be thankful for someone who has passed away.
There is another type of appreciation, as one of the commentators said earlier, which is like "music appreciation" - it means being able to appreciate the qualities of something, a work of art, a person, nature.
No doubt, this is entirely possible to work on without thinking of someone to direct apprecition
to.
But I think the human being requires relation as part of their appreciation - and that's why people tend to worship, or deify, artists these days. Or youtube stars, or whomever.