I have built this circuit. It does stuff.
The 47μF capacitor slowly charges, and while it charges, activates the transistor, which slowly ramps up the voltage to the LED, lighting it up gradually. The collector of the transistor slowly allows more voltage through to the emitter as the capacitor charges. The 100kΩ resistor in parallel to the 47μF capacitor allows the capacitor to discharge after the power is cut. The 3,300μF capacitor that bridges pos and ground also allows for a gradual ramp down.
Here's the completed breadboard in action.

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