So we all know Bill Ciphers famous quote, "Reality is an illusion the universe is a hologram buy gold bye", but what does the last part mean? Buy gold? Well, remember how Gideon used those little pins to spy on people? My theory is that Bill is using gold to spy on people as well. He is telling us to buy gold to spy on us. We see on the bottom of him there are little bricks, that may be gold. I think he is connected to gold somehow and can use it to spy on us. That's just my theory though I could be wrong.