I'm usually not one for ground rules, but this thread is slightly different: there's been some heated argument lately about railroading and Illusionism between our stalwart stage magic minority (who persist in engaging this forum despite the general anti-Illusionist sentiment) and the noisy crowd who can't let an Illusionist argument stand. (I say this with love; it is the human instinct to strike at a differing viewpoint, but that can grow somewhat unfortunate when the discussions of these contentious issues devolve into endless cycles of Paul nitpicking Tod about what his words really mean, and then nothing gets done.)
Therefore, hey presto! A thread in which we shall discourse upon Illusionism and perhaps even railroading in a strictly positive light. I have some vague memories of maybe having seen something similar some years back, but that's what the cyclical Internet is all about: opportunities to air your experiences and opinions for new people.
In case it wasn't clear, this thread is off-limits to "I was bored when the Illusionist GM pre-empted all my choices" and "I felt betrayed when the Illusionist GM forced their preferred outcome". That's such an everyday discussion with us here, we've already had it, and it leaves the people who might have something positive to say about Illusionism stuck raving defensively against people who say nasty things about their chosen tools of roleplaying. There's a bunch of other active threads in which we can continue complaining about who said what about whose mother.
(Yes, I am aware of how amusingly PC-brigade this thread introduction is shaping out.)
I'll put down some thoughts myself soon, but I hope others will also say their piece about the constructive artistic possibilities of Illusionism; I frankly don't have very deep pockets in this regard myself, Illusionism is very much something I've moved away from in roleplaying. I've kept my hand in a bit with Participationism, though