Based on the answers provided, the following corrections need to be made to the 3D object:

1. The object should be redesigned to resemble a pillar. This means it should have a vertical structure instead of a horizontal one.
2. The base of the object should be clearly square-shaped. This might require adjusting the angles and edges of the object.
3. A smaller rectangle should be added to the object and it should be centered at the same location as the square base.
4. The length of the smaller rectangle should be made the same as the square base.
5. The width of the smaller rectangle should be adjusted to be around half the width of the square base. 

Please ensure these changes are made while maintaining the aspects of the object that were not mentioned in the feedback.