Your fave "avantgardish" Progressive Rock albums?

If you don't like Devil Doll's last spine-tingling album (my favourite) then it's best to avoid all of them, or they might give you nightmares. 

Devil Doll are devilishly good, if you like that kind of thing. They make Dead Can Dance sound positively mainstream by comparison.

I would say this is what you have inferred, rather than what you've learnt, and I would (once again) caution you in your inferences, as you do often seem to come to conclusions that were not intended by the original posters. Not to say I am right, or that you are wrong, but I have seen little to nothing that suggests that people do not listen to some music they find "challenging" so much that they either don't find much challenging, and/or what you might call "avantgardish" they don't find challenging at all. I think you would do well to disregard the notion of what is (or is not) challenging, as it really does not have much to do with what is (or is not) "avantgardish".

Whether something is challenging has a lot to do with when someone encounters it. I have no doubt that a lot of the music I listen to these days, and don't find challenging at all, I would have found "particularly challenging" - perhaps even challenging enough that I might have given up - had I listened to it when I were younger, and had heard little that was outside the mainstream and conventional comfort zone. Nor have I have ever shirked from challenging music. But what challenged me when I was younger were sounds and styles like hip hop, ambient, industrial, funk, soul, and extreme metal - all styles somewhat adjacent to, or even part of, the mainstream. The avant garde (or "avantgardish") was not even in my sight - or perhaps, rather, my hearing.

Remove the idea of challenging, and I think more people might be willing to discuss the "avantgardish" music they listen to. Although it will still be difficult for many, I suspect, simply because as a descriptor "avantgardish" seems even almost devoid of meaning or definition. While I appreciate this is because you would like to know what our own definitions are, it is hard to fit definitions to a made up word from someone else. 

Those are 4 albums I thought about when originally posting on this subject.

 

You're welcome! It helps that I can define my own idea of what is "Avant Prog" instead of keeping strictly to PA's definition. If you like the haunting sound of Jacula, then you may like Antonius Rex too, as they're both from the same Italian vineyard, so to speak. 

I couldn't possibly comment on Amon Dull II, Magma or PFM as I've never listened to those three bands, but since when have Caravan not been part of the Canterbury Scene when they're from the Canterbury area? 

They've been around so long, I'm surprised that they're not paleo-prog and neo-prog at the same time, sort of a poly-prog band.

Btw, talking about contradictions....