After you have part of your arm or leg amputated, there's a chance you could feel pain in the limb that's no longer there. This is known as phantom limb pain. Our possessions and relationships are our phantom limbs.
Knife can be used as a murder weapon, as well as a surgery tool. Acid can burn, as well as digest. Vehicle can drive near, as well as drive far. Chemical can act as a medicine, as well as act as a poison. Self can sqize to mortal ego, as well as can expand to immortal whole.