Puritan Board Graduate
I do see the gray area, however here are some thoughts. God has chosen to reveal himself to us using words, spoken and written. The Spirit works according to the power of the Word he inspired.
As to the pedagogical use of drawing connecting lines on the chalk board, that is still something different than creating a symbol/image and calling it God.
Given the very real danger of idolatry, what value do you see in creating and using such images? I suppose it comes down ultimately to a question of the sufficiency of Scripture.
I agree that there is a difference between the teacher's pedagogical use and the creation of an image and calling it God. I just think that the example of the covers of the Trinity Hymnal and Psalter is closer to the former rather than the latter.
I'm not really interested in using symbols to represent the concept of the Trinity; I'm just not ready to condemn the practice of those who do.