In the blocksworld domain visualization, each object is represented by a specific shape and color that conveys its properties and status:

1. **Shapes**:
   - **Rectangles** represent blocks. Each block is drawn as a rectangle to symbolize its physical presence in the blocksworld.
   - **Large Rectangle** represents the table. It serves as the base and supports other blocks, indicating that blocks can rest on it.
   - **Oval** represents the hand. The oval shape is distinct from the blocks and table, highlighting its different role (i.e., manipulation of blocks).

2. **Colors**:
   - **Green** indicates a "clear" status for blocks, meaning no other block is stacked on top of it.
   - **Red** indicates a "not clear" status for blocks, meaning the block has another block on top of it.
   - **Gray** is used for the table, indicating its neutral status as a support structure.
   - **Blue** is used for the hand when it is empty, indicating readiness to pick up a block.

3. **Sizes**:
   - **Medium Rectangles** for blocks ensure uniformity and clarity, making it easy to compare and stack blocks.
   - **Large Rectangle** for the table signifies its ability to support multiple blocks.
   - **Small Oval** for the hand, indicating it is not a storage space but a tool for manipulation.

4. **Positions**:
   - Blocks are positioned either directly on the table or on top of other blocks, reflecting their current state in the blocksworld.
   - The hand is positioned above all blocks, symbolizing its potential to interact with any block.

5. **Legend**:
   - A legend is included to map colors to statuses (e.g., green for clear, red for not clear), ensuring the diagram is self-explanatory and accessible to viewers unfamiliar with the domain.

The combination of these visual elements provides a clear and intuitive understanding of the blocksworld's current state, allowing viewers to easily identify the status and relationships between different objects.