What the difference between the elements of art and principles of design?
To understand this difference properly, you could refer to an example from cooking. In this case the Elements of Arts are your ingredients (colour, line, space, texture, form, value, line), but because your a good cook you will spend some time on getting to know them, exploring them and understanding them. A good chef is always looking for quality ingredients, so is an artist.
The principles of design is your recipe, you can not expect when throwing all ingredients randomly in a pot you'll get a great dish. No you put them in and arrange them carefully. The principles of design are basically an arranged way of using the elements of art in an artwork. The elements can be arranged in a work to create, balance, emphasis, unity, proportion etc.
No elements - No principles No ingredients - no recipe