Called "The Mushroom Man," BG216 was one of Singer's most psychedelic posters. The diminutive runner, stripped of his vanities, padded towards the cosmos via the not-so-subtle mushroom portal. Singer himself noted the collage had a "... certain LSD mystique." BG216 was the artist's second of four posters for the Grateful Dead.
During his Fillmore era, from 1969-1971, Singer created more posters for Graham than any other artist. Singer's posters are notable for his use of collage, incorporating thousands of images clipped from magazines spanning several decades. He developed a format that included a stunning variety of lettering styles, applying them in close relation to the theme or subject of a poster.