A slot interface access device including a slot management module; a slot control module; and a physical slot to management slot contrast table, the slot management module, the slot control module, and the physical slot to management slot contrast table being provided between an input and output control module and a slot interface lower than the input and output control module. An optical set-up introduces angles between each two of the sub-beams, which are chosen to produce uncorrelated speckle patterns in the projection screen plane, resulting in an interference speckle pattern. In addition, a clone latch is specified within the digital design utilizing an HDL clone latch declaration. Further, the invention provides a skeletonization and skeleton analysis technique for extracting biologically-relevant features from cell shapes.