Need Help With Knockout Blending

I've just discovered the existence of the Knockout feature in the Layer Blending Options. If you select Deep Knockout it allows your current layer to bypass all intermediate layers below it and instead blend only with the original, bottom Background layer.

I tried a few experiments and got Deep Knockout to work, but it only seems to work if the original background layer is present and intact. If I delete or rename the background layer, or substitute something else as my bottom layer, the Deep Knockout doesn't recognize this new bottom layer as the "Background" and drills right past it down to emptiness---an entire screen of blank pixels.

How do I take the bottom-most layer of my stack and redefine it as a Background, so that Deep Knockout will recognize it? (Also, I've never understood why Photoshop even bothers with the background layer, what special properties it has, and what advantage it provides vesus any other "normal" layer that sits at the bottom of the stack.)

Thanks


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