Micro Blocks
Micro blocks are small versions (1/8th the size) of normal Minecraft blocks. Most obtainable blocks in the game have an equivalent micro block. TheySome blocks with multiple states, such as redstone lamp, will have different micro blocks available for each state.
Micro blocks exist purely for decoration and are non-functional.
Obtaining Micro Blocks
Micro blocks are offered by wandering trades. They will have a random selection of 5-20 micro blocks at any one time. The trades will always offer 8 micro blocks for 1 emerald + a normal block. The wandering trader only keeps enough stock for a single trade of each block type.
Misc Info:
Some blocks (such as the lit redstone lamp) are unobtainable but still have a chance to be in a trade. This does not apply to blocks like bedrock, command blocks, or barriers, only blocks that do have an obtainable version. All versions can appear in a trade.