How does something like that work in Minecraft?

I recently felt like watching Adventure Maps Video again.

I've seen the following video several times, but I still don't understand how the following works:

There's also a pressure plate on the ceiling. No mods are installed.

Does anyone have any idea how this works?

Would also like to do that in a building of mine.

Maybe latest version of Minecraft?

No, the map is as far as I know for 1.7.4

You can easily rotate blocks and other objects using commands. The map creator must have used commands to place the printing plate on the ceiling.

And how exactly can you make this wall with the command blocks?

You mean the one that is getting tighter? You can also use blocks to e.g. 0.5 shift. Then it is shifted by half a block

Then just specify a half coordinate or how?
/ setblock 1.5 ~ ~

Yes, but you have to. It doesn't work otherwise

In this world 100% mods are installed

Unfortunately, this is not possible with the Vanilla Commands

Not really? I thought I could have done it before. But I can't experiment now either. I'm actually at work, just have no task and I have already finished the tasks that I have done for myself.

Of course with a dot. Don't even know why I just used a comma

But can't be…

There are no download links for mods in the description of the map.

Moreover:

The previous two parts (The Code II and The Code I) didn't have any mods, so why start now?

As for your first point, that there are no links to mods in the description does not mean that they are not installed.

There's, however, another possibility that occurred to me. Namely assign a block to the entity, which also has falling sand, and then float it to a specific location.

It would go like this:

/ summon minecraft: falling_block ~ ~ ~ {BlockState: {name: "minecraft: stone"}, NoGravity: 1b, Time: -2147483648, tags: ["wolffe2"]}

To destroy the entity again you have to execute this command:

/ kill @e [tag = wolffe2]

You can easily move it with tp

However, if you have too many of these "blocks" in the world, they will start to lie. Furthermore there's the possibility with a texture / resource pack.

The printing plates on the ceiling are therefore either fake (with the help of texture pack or the above option) and therefore do not really work, especially you can't stand on them or they are mods that do this

You can (especially not in 1.7.4, because you can't even pack TexturePacks into the worlds) you can't install mods in worlds.

If you installed mods and then join an unmodded client, everything that has to do with mods will be removed or your Mc will crash.

That with the falling sand sounds pretty good. The only problem is that you couldn't go through there

You just have to use another block such as Put a trapdoor behind it.