Mark McCloud's LSD Blotter Art Collection Anchors New Bay Area Triennial

San Francisco artist Mark McCloud will show the most comprehensive display of his Institute of Illegal Images in four decades this spring, as part of a new Northern California triennial launching across roughly 100 Greater Bay Area venues.

The exhibition, "Institute of Illegal Images: Return of the Rebel Replevin," runs at Et al. Gallery, a storefront space in San Francisco's Mission district. It presents what McCloud bills as the world's leading collection of LSD blotter art — the printed, perforated sheets of card stock on which LSD is typically distributed.

"I've been at it since the mid-'60s, collecting it in the inside of my body first and then in my freezer, and then I started framing it in the '70s," McCloud said in a phone interview. "That's the way you save them. You'll choke on the frames if you try to eat them!"

McCloud has amassed thousands of sheets over decades. Each is perforated in a gridded pattern and printed, often with repeated imagery; when used by dealers, each square carries a single dose of acid.

The collection's name parodies the seriousness of the museum, even though this kind of material has traditionally received scant attention from actual institutions. McCloud has exhibited the sheets annually at Psychedelic San Francisco Gallery on Bicycle Day — an unofficial celebration of the first LSD trip, taken by the drug's inventor, scientist Albert Hofmann, in 1943 while cycling home from his lab.

The imagery on the sheets runs the full range, McCloud said: "from the most comical to the deepest religious approach, because many people have mystical experiences on LSD and others just have a really good time. It's a full cornucopia."

Zully Adler, a former research fellow at the San Francisco Museum of Modern Art (SFMOMA) and director of the Further Triennial, organized the show. Adler will curate three additional exhibitions for the triennial, including "How Many Worlds: Martin Wong in California" at the Berkeley Art Center, "Paulina Peavy: Ether Beam" at the San Francisco Historical Society, and "Demetrio Braceros: Kindness to Any Creature" at the Cayuga Playground Clubhouse.

"Northern California is still a place of well-kept secrets—amazing things hidden just under the surface," Adler said. "A lot of our artists and what they make test the limits of what constitutes fine art or advanced art and is anointed as such ex post facto."

The Further Triennial is the first exhibition of its kind dedicated to Northern California. Its shows will spread across about 100 nonprofit visual arts organizations in the Greater Bay Area, including SFMOMA, the Fine Arts Museums, and the Institute of Contemporary Art in San Francisco, plus Marin MOCA, the San Jose Museum of Art, and the Berkeley Art Museum and Pacific Film Archive. The triennial takes its name from the school bus that San Francisco author Ken Kesey drove across the US in 1964 with his "merry band of pranksters." Its inaugural edition, "Around Here," opens in March 2027.

Art collector and philanthropist Robin Wright founded the triennial. A San Francisco resident since the 1980s, Wright visited the first PST ART initiative — founded by the Getty Foundation in 2011 to focus on Southern California — and saw the need for a comparable project centered on her own region.

McCloud first showed the Institute of Illegal Images at the San Francisco Art Institute (SFAI) in 1987 to mark the 20th anniversary of the Summer of Love. The Further exhibition coincides with the 40th anniversary of that debut.

The attention that followed cut both ways. In 2000, FBI and DEA agents arrested McCloud in what Artnet Magazine called a SWAT-style raid, charging him with felony conspiracy to distribute the drug — charges that carried consecutive life sentences. Artnet reported that none of the nearly 400 framed blotters seized in the raid, nor any of the artist's 33,000 sheets, contained traces of the drug, since exposure to light causes LSD to decay. McCloud was acquitted in 2001, partly on the basis that his holdings were art; art critic Carlo McCormick testified. When the collection was returned, it carried FBI-issued evidence catalog numbers on strips of masking tape. Those returned works form a focus of the new show. The title's legal term, replevin, refers to an action allowing a person to recover property wrongfully taken or unlawfully held by another.

The printed imagery leans lowbrow, Adler said — visitors will see Beavis and Butthead, Ozzy Osbourne, and Conan the Barbarian — but designs by Op artist Bridget Riley and some of her peers also appear, a nod to the optical wonders often revealed during acid trips. Most artists remain anonymous or work under pseudonyms, since the sheets were created to transport illegal drugs.

"Here is somebody who recognized this underground medium as a realm of creative expression when others were far from seeing it that way," Adler said of McCloud. In the pop-culture references and gridded layouts, Adler sees potential affinities with Pop art and Minimalism. "But that wouldn't have been an obvious connection in 1987, when these things first appeared at SFAI."

A modest market exists for these artifacts. Sheets sell privately and online on Etsy, eBay, and even Amazon for over $1,000, McCloud said. The highest price he can recall is $36,000, paid at a benefit auction for the family of psychedelicist biochemist Alexander Shulgin.

With "Return of the Rebel Replevin," Adler and McCloud position four decades of federally contested ephemera at the front door of a regionwide institutional project — one that will ask roughly 100 Bay Area organizations to reconsider what counts as art when Further opens in March 2027.