An iris diaphragm is an aperture with a variable opening diameter. The majority of instances of irises can be found in aperture settings in camera lenses as a means of regulating depth of field and the amount of light that is exposed by either film or sensor in capturing an image. aperture, being an array of irises, is part of a building's facade. Composed of single aperture-modules with receptor (LDR—light dependent resistor) and actuator (servo-motor/iris), aperture acts like an autonomous skin, which is also capable of precise external control. Visual information is transmitted from the inside of the building to the outside, the surface permeability is regulated when the aperture's opening diameters are changed. Each of the apertures in the array can be used to represent a pixel of an image.

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