Nowhere does Paul state that the gifts he discusses in chapters 12-14 are "unseen". That's your addition to Scripture, and that little addition has corrupted your understanding of the gifts completely.
2 Corinthians 4:18While we look not at the things which are seen, but at the things which are not seen: for the things which are seen are temporal; but the things which are not seen are eternal.
Its what against those that add to scripture with the oral traditions of men. Same kind of mentality that made Jesus into circus Seal a side show. Saying perform a miracle then we will fall backward to confirm we believe. Hoping someone will catch . .
John 6:30They said therefore unto him, What sign shewest thou then, that we may see, and believe thee? what dost thou work?
Jesus knew their mind set. He would have no part in the side show. Called a fuller grace, lets get filled with the experience ?
John 4:48Then said Jesus unto him, Except ye see signs and "wonders", ye will not believe.
If the gift came freely as faith which came from hearing the unseen eternal. Then we can say it is a spiritual gift . Nothing observable to the eye. No outward noise or falling back among others like holy laughter, holy crying etc. .or anything to propmote self edification (I did it) Things that are exclusive to those called charismatics... sign gifts.
Signs are for those who do not have faith. Prophecy for those who do have the unseen eternal
The Spirit of God has no form as invisible. We walk by the invisible work of faith. It is Emanuel God with us working in us to both will and do his good pleasure .It is called a imputed righteousness .
No one has received their new incorruptible body the one observable "sign gift" .