An EDA tool is provided with the ability to re-express a design cell of an IC design in terms of placements of a number of newly formed intervening constituent design cells, the IC design having a number of hierarchically organized placements of design cells. The gradual excitation control circuit includes duty characteristic varying means for varying the excitation duty control characteristic. Furthermore, the composition includes a copolymer component that provides photoconductive ability, non-linear optical ability, and plasticizer ability, optionally, sensitizer and plasticizer components.