Method 1: The Art of Faking It
You see, it's all about confidence. A good feigning presence is about exuding an aura of "I'm totally a real person, I swear."
First, you must master the art of eye contact. Stare intensely into the void, or at a nearby wall, until you're sure no one's paying attention.
Next, work on your body language. Slouch, slump, and generally look like you'd rather be anywhere else.
Finally, deploy your most convincing smile. It should be somewhere between a constipated grimace and a maniacal cackle.
And voila! You've got a feigned presence that's sure to fool even the most discerning eye.
Or, you know, you could just be a robot.