How did ancient oil lamps work?

Ancient oil lamps were one of the earliest sources of portable and artificial light. It dates back to 15k years. Today, an oil lamp maybe a decor choice and an emergency lighting source. The mechanism uses an absorbent wick to transport liquid and fuel that is consumed by the flame. When used appropriately, these can be more effective than candles. You can use mustard and kerosene oil to bring back the ancient oil lamps.