1. **Is the base of the object square-shaped?**
   - **Answer:** Yes
   - **Reasoning:** From the images provided, the base of the object is clearly visible as a square in the second image, where the object is viewed from above, showing a square base.

2. **Is the object extruded along the Z-axis?**
   - **Answer:** Yes
   - **Reasoning:** The object appears to have a consistent cross-sectional shape (square) along the height, which is typical of an extrusion process along the Z-axis. This is evident from the uniformity of the shape in all images.

3. **Is there a smaller square at the top-right corner of the original square?**
   - **Answer:** No
   - **Reasoning:** The images show a smaller square centrally located on the top face of the object, not at the top-right corner. This is visible in the second image where the smaller square is clearly in the center.

4. **Is the smaller square approximately 1/5th the size of the original square?**
   - **Answer:** Unclear
   - **Reasoning:** Without specific measurements or scale references in the images, it is difficult to accurately determine the proportion of the smaller square relative to the original square.

5. **Does it appear as if a chunk is missing from the original extruded object due to the negative extrusion of the smaller square?**
   - **Answer:** Yes
   - **Reasoning:** The images show that the smaller square is recessed or indented into the top face of the object, suggesting a negative extrusion that removes material from the original extruded shape. This is particularly evident in the second image where the depth of the smaller square can be seen.