Was debating whether to post these, they stretch the limits of what one would call stamps.
Thanks for posting,
there is no need for anxiety, they exist, they have history and why not post?
If you need to categorise, how about "Curiosities" ?
These are called "Lenticular" Ajman's clumsy attempt in the early days, is mirrored in the Latest 2021 United States Stamps (Lenticular)
I refer to them as labels, but I have them on genuine postage.
Horrible things to try and mount, mine are in little bundles
with rubber bands.
Countries that have produced
3D stamps with one or more images Not lenticular movement