Successful model must be with a pattern of rapid reproduction, and this model should have the ability of self-control so as to achieve the standardization of duplication.
The Angle spectrum analysis of self-image of double frequency grating is given. The grating duplication and the measurement of lens focus are obtained by Tablot effect of holographic phase grating.
On account of its chemical structure and the spatial relations between the constituent molecular parts, it is capable of self-duplication, correct in every detail.