An electric residential lighting dimmer switch...

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The University of Utah has a visual aide that allows you to adjust how your genes are wound tight or loosened up, thus adjusting how much protein they are making. Try turning the knob up and down and watch the resulting amount of protein being produced. This protein may be making red blood cells or new cell walls or communicating with other genes in the cell or other genes in other cells. The programming is complex but the principle is easy to understand. The control knob is like a dimmer switch on your light and the amount of protein is like how much light gets produced as you adjust the knob. Our health or illness is which combinations of genes are invoked by these proteins.