If the Rule “Items” does not exist, this Proposal does nothing.
If the Proposal “Goosebump potential” did not pass, this Proposal does nothing.

Otherwise, add the following two sections to the “Items” Rule:

=== Odd sheet ===

Description: Reserved for Seventy-Fifth Trombone.

A flexible, chalk-white, perfectly rectangular sheet of unknown composition.  It has roughly the area of your hand, but it is noticeably thinner than the thinnest man-made paper, and it’s impossibly heavy for its volume—it weighs as much as a book, though it looks like a single page from one.  It does not tear; in fact, all attempts to blemish it are futile.

Someone, however, knows how to blemish it; in one corner it bears a tiny inscription, which is at once barely visible, easily legible, and (remarkably) in English:

“See manual.”

=== Instruction Manual ===
Description: Reserved for Seventy-Fifth Trombone.

Yep, I know it’s cheesy.  Yep, it’s supposed to be.  Yep, I do have an idea what this stuff is, and/or what it does. Yep, it’s just a prototype of what we could do later.