This resource pack includes Dirt and Cobblestone as item.
When you place them into an invisible item frame, they are looks like blocks.
However they are items in item frames, so they do not have hit box.
You can use them as a hidden gate for your secret base or a trapdoor for other players.

You may notice the difference of shadow in the third picture.
It is ambient occlusion, the shadow on the corner of blocks.
Because the hole is item, there are no shadow on the corner.
As in the second picture, you may want to put hole one block higher.
Here is a movie: youtu.be/ciyKAFufpSM
Here is another sample: gyazo.com/8d8f8199b1f027958bf87e51c5e020f1

This pack uses the Wheat Seeds System. For the wheat seeds system, see this guide: scrapbox.io/nishio/WheatSeedsSystem

IDs:
* 1300: hole_dirt
* 1301: hole_cobblestone