Beyond a dime-bag of weed snagged from your best friend's older brother, the secret of being that '70s stoner was simple: Wear your hair long, invest in a good record player, and fill your childhood bedroom with as many blacklight posters as you could fit on your four walls. 

Often boasting comic book characters, mythical creatures, or in its most literal applications, giant glowing mushrooms, blacklight posters were an unofficial badge of high honor, quite literally lighting the way for teen stoners to enjoy their high, best accompanied with yet another listen of Pink Floyd's "The Dark Side of the Moon."

From vintage posters all aglow to young people relaxing in their bedrooms, here are 23 vintage posters that shine bright in the black light of the '70s.