What does this mean?
If a block takes up a full block of space in the Minecraft world.
Dirt, Sand, and Stone would be against this rule.
A sapling, red stone, torches, and I'm going to say water and lava since it technically doesn't fill a full space. Other examples would be half-steps, ladders, and stairs. Doors too.
But wait, no workbench? WTF? Without a bench, you can't make any tools to mine any minerals, therefore not being able to place most of the previously stated items.