Here is a fairly simple decorative Absent by Design 1.16.4-1.15.2 modification, which is designed to introduce you to some new types of semi-blocks, walls, stairs and fences of vanilla blocks.
How to install Absent by Design Mod
- Download and install Minecraft Forge
- Download a Mod
- Unzip it and copy to C:\Users\User_Name\AppData\ Roaming\.minecraft\mods