The test is supposed to be a deeply personal experience, and I think involving the player is a great way to simulate that. Also, for potentially traumatic events, if a DM is going to go there, the player needs to buy into it.
I said it in the other thread but I love (and I know people will push back against) the idea that the player gets to be part of this, and help make the adventure.
I agree with
@darjr that comparing the art to one of the Four Horseman is a high bar to clear. I'll also point out that looking at a quick sample of his Raistlin and Dalamar illustrations, he was always careful to place them against a background that wasn't black. I would imagine that if Elmore had to draw a black robed mage against a pure black background he might have made the robes grey as well.
This is also an excuse to retell one of my favorite TSR artist stories. One day the TSR artist pool got to meet one of the Brothers Hildebrandt. And naturally, they begged him to critique their work. He demurred, but they insisted, so he finally took a look at the piece handed to him, by Larry Elmore. And then he said "there's something obvious here, and you're not going to be able to unsee it once I point it out to you. The only light is from the torch, right?" "Yeah," Larry Elmore said with dread rising. "If the only light is from the torch, how are Palin's robes showing as pure white?"
Their mastery of light and shadow was one of the things that made the Brothers Hildebrandt so great...
And if you haven't seen it, the Eye of the Beholder documentary is a must-watch.
Eh, maybe I’m too used to the old Elmore pictures, but I don’t much like the look of the “black robes” - they look gray, not black. Raist wore them better.
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Anyway, back to the subject at hand. One of the things that the video left me wondering is what are the rest of the players supposed to do during the test? I would hope that there are suggestions on ways to involve them beyond just sitting there watching it happen.