The document describes how to build a "Trick Switch" circuit using an Arduino, pushbutton, LED, capacitor, and resistors. When the pushbutton is pressed, the LED turns on. After releasing the button, the capacitor stores energy from the power supply, keeping the LED on for a few extra seconds until the capacitor discharges. The circuit is modified to add an indicator LED to show when the timing cycle finishes. Schematics and code are provided to build and program the circuit.