Thanks for suggesting this technique. When I try it, I find that I quickly get into a "lots of vibrations" state. And then I noticed that it's easy to take that perception of something else as being the watcher and transfer it to pretty much any sensation. So I've been playing with taking a sensation and regarding *it* as the watcher. Strangely, it seems to work with all sorts of sensations, and it appears to be good for "penetrating" through regions of apparent solidity.
So, it's not intuitive, but the often-given instruction of "whatever arises, observe it" can be dualized into "whatever arises, let it observe".
I don't have particularly good visualization powers (that I know of...) but it seems like this exercise is doable without them. It's more about flipping the notion of what's the watcher and what's the watched.
While I'm at it: Thanks Kenneth for your open letter. Down-to-earth accounts of enlightening are amazingly encouraging.
This is my first post since I overenthusiastically asked "was that an A&P??!?!?" without reading the FAQ first

Thanks for all the tolerance. I'm still curious to know what stage I'm in. To judge from advice given by Ken to John (=n8sense, "Spasms while meditating") it's possible that I'm in the 4th ñana. However, I did have that very intense A&P-ish event together with signs of dissolution that one time, so it's not entirely clear.