I always regarded idol worship as requiring the external, physical, gross, but here it says:
The Deity form of the Lord is said to appear in eight varieties — stone, wood, metal, earth, paint, sand, the mind or jewels. [SB - 11.27.12]
First, it is not clear to me what mind-based idolatry is. What exactly is it? Is is just feeling/emotion? Or more like a visualization technique?
If there an advantage to mind-based idolatry?