My vector drawing of a horned skull for Halloween.
The Halloween holiday is commonly thought to have pagan roots. Historian Nicholas Rogers, exploring the origins of Halloween, notes that while "some folklorists have detected its origins in the Roman feast of Pomona, the goddess of fruits and seeds, or in the festival of the dead called Parentalia, it is more typically linked to the Celtic festival of Samhain, derived from the Old Irish Samuin meaning “summer’s end”. Samhain was the first and the most important of the four quarter days in the medieval Irish and Scottish calendar and, falling on the last day of autumn, it was a time for stock-taking and preparation for the cold winter months ahead. There was also a sense that this was the time of year when the physical and supernatural worlds were closest and magical things could happen. To ward off these spirits, the Gaels built huge, symbolically regenerative bonfires and invoked the help of the gods through animal and perhaps even human sacrifice.