The problem with much of the ephemera and printing related material is that it has come on the market long after the people who created it have passed, leaving many unanswered questions.
This applies to photographic material as well as the engraved emanations which are shared here.
When does material, such as die work or photographic work, become directly related and collectible as part of the story behind the production of the stamp?
The card and india proofs of the 19th century were products of the USPOD, but had nothing to do with the stamps when they were issued. I'm particularly referring to the P1-P4 proofs here. These are all Scott listed.
There is a lot of material which I believe should be listed, but still has not made its way into the catalogs. These include photographic essays and publicity materials, including publicity photos. Some of this material should be considered essays as they vary greatly from the finally issued designs.
Here's an example of what I'm talking about.
The stamp in question is Scott 1135, the 1959 100th Anniversary of the American Dental Association stamp. The first image is the actual stamp.

Before the stamp was issued, a publicity photo of the expected design was prepared and mailed out. This is shown below.

Evidently, feedback about the little girl in the image, either from the editors and cachet makers who received this publicity photo, or from someone in the USPOD, caused the change to the issued design. A second publicity photo was prepared and released, showing the finally adopted and issued design. This is shown below.

So, my question is - and has been for some time - why is this first publicity photo not considered an essay? It was produced by the USPOD/BEP team and released, making it an official product of the government. This is more than can be said of some of the listed essays in the catalog (think Schernikow essays). I've talked about this with some of the leading dealers in this material and the only answer I get is that it just isn't an essay.
Perhaps the first thing we should do, as a collective group, is create some standard terms to be used when dealing with this type of material. While we have the definitions created by people like Clarence Brazer, they have not been changed since he first created them. This, despite the wealth of material which has come on the market in the 70 years since he published his monumental work, much of which doesn't fit neatly into the listings and definitions he created.
Another consideration is that methodologies used by the USPOD and BEP have changed greatly since 1947. It is still evolving and terminology used today is vastly different than that used by Brazer.
Just because something has always been that way doesn't mean it can stay that way, and our terminology is in need of a 21st century upgrade.
When we talk about stamp production, we have to keep in mind that today, the BEP no longer creates our stamps and the proprietary nature of the businesses involved in the production of our stamps is such that we, as collectors, no longer have the ability to ask someone about how they are creating the stamps, the processes used or procedures involved in creating a design.
The current stamps are no longer created in hard copy, but are all graphically created digitally. Future generations of collectors will have no ephemera to help tell the story, or very little of it, as it no longer is available in hard or tangible formats.
What do we have? Digital images. But usually only finished images, nothing in the design process. Occasionally, something gets out and into the collectors' market.
Here's a rare piece which somehow managed to survive and did just that. The stamp is Scott 3331.
First, here's the final design, as issued.

Here is the proposed design, provided on a comment sheet. This design is, to my way of thinking, a much more powerful statement than what was issued. What do you think?

Finally, what worries me most is that much of the material I'm talking about is being - and has been for decades - destroyed, put in the trash and considered worthless. But it is an important part of the story behind the stamp and often helps explain why the stamp was issued as it was.
Shouldn't the material I've shared here be included in a catalog? I certainly think so. The historical significance is part of it. Also, without it being known and understood, why should we - as collectors - bemoan the fact the material is being destroyed. Listing it in a stamp catalog at least gives someone who sees it a point of reference and an understanding that someone, somewhere, would have an interest in it.
What do you think?