Mysterious origins of Dream Mary (aka Fancy Mario)

[treismac]

While reading Satoshi Matrix's blog, I stumbled across Dream Mary for the first time. For those who don't know, it is a cartridge mod that interferes with the game's mirroring function creating a "a bizarre scrolling effect in which the screen splits in half: the right half is unchanged but the left half of the screen displays what’s way ahead of you, on the next screen" (http://133fsb.wordpress.com/2009/11/...y-on-a-budget/). I wanted to know what if anything noteworthy ya'll might be able to tell me about the lore of this interesting game modding technique. Any and all links are also appreciated. Thanks!