I think this is about how we're slaves to the dogmas we believe in. Triangles are often used in a spiritual context -- they represent different deities: the holy trinity (like horriblehorst mentioned), pyramids meant for worship, and even in masonry the triangular shape is considered sacred. I'm sure there's more examples that link triangles and spiritual beliefs.
I guess one of the possible interpretations of the song is to "beware" that prayers and triangles placed in your mind can emprison you (you'll never be free).
I think this is about how we're slaves to the dogmas we believe in. Triangles are often used in a spiritual context -- they represent different deities: the holy trinity (like horriblehorst mentioned), pyramids meant for worship, and even in masonry the triangular shape is considered sacred. I'm sure there's more examples that link triangles and spiritual beliefs.
I guess one of the possible interpretations of the song is to "beware" that prayers and triangles placed in your mind can emprison you (you'll never be free).