What is the difference between the principles of design & the elements of design ?

Principles of Design are the law of designing anything.When making a design the5 principles are 

1) Unity & variety

2) Emphasis & Focal point 

3) Scale & Proportion 

4) Balance

5) Rhythm

Elements of Design are things that are involved in making a design,The Seven Elements of Design,

1) Line

2) Shape & Volume

3) Texture & Pattern 

4) illusion of Space

5) Illusion of Motion 

6) Value

7) colour 

These are the Differences,