A particularly interesting nanostructure is that of CdSe nanocrystals which can be readily synthesized in a university laboratory setting. These will have the same wurtzite crystal structure as bulk CdSe but will consist of just hundreds to thousands of atoms. These structures can be grown to a desired size and as size their increases, the energy of the first excited state decreases (in qualitative agreement with the particle-in-a-box model), thus they serve as accessible experimental systems that link theory and tractable experimentation .