The half blocks were hidden, but I circled them for an easier time looking for the new blocks
Half Blocks are blocks that are confirmed to be one of the new block types to be added in Eden Update 2.0 (formally known as 1.8). These blocks are simply blocks that are the same length and width, but are half the height of a regular block. These can be easily used as decorations or as porches and will commonly used to be more precise when building. These could also add to the look of a castle or for stairs. It is unknown if you need to jump up to get up these blocks or just move up them to go up them like a staircase (which could also be a possible use for them if the latter is true). Half Blocks can also be useful for details on a house or building. Along with Half Blocks are Big Blocks, which is the same as 8 regular block, and small blocks, 8 of which would create a regular sized block.