Dates & times
All times are local to the venue · America/Los Angeles
- Wednesdays11:00 AM – 8:00 PMSep 25, 2026 – Jan 31, 2027 · Ends in January 2027; exact closing day not announced
- Thursday, Friday, Saturday, Sunday · weekly11:00 AM – 5:00 PMSep 25, 2026 – Jan 31, 2027 · Ends in January 2027; exact closing day not announced
Rael San Fratello: Prototypes and Provocations at YBCA
YBCA’s cylindrical commission Sanctuary was 3D-printed onsite from soil, straw and water. Its construction method is one focus of Rael San Fratello: Prototypes and Provocations; a nearby display of printed objects broadens the inquiry to materials including grape skins, coffee grounds and wildfire ash.
Building material, made visible
YBCA presents Sanctuary as a demonstration of building methods developed by the Oakland architecture and design studio. The cylindrical structure makes its ingredients and method central to the work, rather than leaving construction as a hidden step behind the finished form.
The exhibition description also sets out a large table of 3D-printed objects made from materials YBCA characterizes as sustainable, upcycled or recovered from waste. The list includes salt, Chardonnay grape skins, coffee grounds, clay, sawdust and ash gathered after California wildfires. Together, the commission and the objects put different scales of material use in view, from an earthen structure to printed forms.
Virginia San Fratello’s work combines industrial 3D printing with knowledge of building materials. Her other projects include Emerging Objects, a 3D-printing studio, Forust, a company built around printing with wood waste, and Muddy Robots, which is developing robotic construction using raw earth. That background connects the exhibition’s material experiments to a broader practice, rather than treating the table as a catalogue of unusual ingredients.
Further reading: Rael San Fratello: Prototypes and Provocations - YBCA ↗ · Virginia San Fratello - YBCA ↗

A studio practice across building and land
Founded in 2002 by Virginia San Fratello and Ronald Rael, Rael San Fratello is an Oakland-based architecture and design studio. YBCA traces its work from early experiments merging clothing and construction through projects focused on the U.S.-Mexico border and, later, work combining 3D printing with traditional earthen materials.
The founders’ practices help explain the range. San Fratello works across contemporary printing and long-standing material knowledge. Ronald Rael is an architect, artist, activist, design technologist and traditional builder, as well as a multigenerational rancher. YBCA describes his work as spanning architecture, art, technology, land-based practice and social justice.
The survey places those subjects within architecture itself: building methods sit alongside questions about land, borders and how power takes shape in shared spaces. This gives the material experiments a social context as well as a technical one.
Further reading: Rael San Fratello: Prototypes and Provocations - YBCA ↗ · Ronald Rael - YBCA ↗ · Virginia San Fratello - YBCA ↗

A border project centered on shared play
The exhibition names the studio’s 2019 Teeter-Totter Wall among its projects. The work consisted of bright pink seesaws installed along the U.S.-Mexico border wall; YBCA frames the shared play as a way to imagine connection across a contested boundary.
The original seesaws were installed at the border. YBCA’s exhibition listing does not say they are installed in Gallery 2, so visitors should not expect the physical seesaws to be there. Placed in the survey’s wider account of the studio, the project shows how Rael San Fratello’s work addresses political boundaries as well as the materials and methods of construction.
Further reading: Rael San Fratello: Prototypes and Provocations - YBCA ↗

Plan a gallery visit
Gallery 2 at YBCA
The exhibition runs September 25, 2026–January 31, 2027, in Gallery 2 at Yerba Buena Center for the Arts, 701 Mission Street, San Francisco, CA 94103. The main entrance to the galleries and forum is at 701 Mission Street.
Rael San Fratello: Prototypes and Provocations - YBCA ↗ · Visit - YBCA ↗
Wednesday through Sunday
YBCA galleries are open Wednesday, 11 a.m.–8 p.m., and Thursday–Sunday, 11 a.m.–5 p.m. They are closed Monday and Tuesday.
General gallery rates and free-admission options
YBCA lists general gallery admission at $10 for adults 18 and older and $5 for students and seniors. Admission is free for youth 17 and under, military personnel and Museums for All visitors. Wednesdays are free for everyone, and members receive free gallery admission for four.
Medi-Cal and EBT cardholders qualify for free admission through Museums for All. Bring the benefits card; tickets must be obtained at YBCA’s ticketing desk. Employees of other museums with current, valid staff ID receive free general admission for themselves and one guest, and must also obtain their tickets onsite.
These are YBCA’s general gallery rates; the exhibition listing does not give a separate ticketing process or price. The Visitor Services desk in the Gallery and Forum Building’s Grand Lobby sells tickets to YBCA-curated programs. Its hours align with gallery hours and scheduled programs. For ticket questions, call 415-978-2787 during gallery hours.
Visit - YBCA ↗ · Rael San Fratello: Prototypes and Provocations - YBCA ↗
Access services and venue policies
YBCA says its public entrances are accessible and elevators serve both buildings. The Gallery and Forum Building entrances at 701 Mission Street and the Garden Esplanade have electric push-button doors. Wheelchairs are available first-come, first-served, and large-print exhibition guides are offered.
Sign-language interpretation for YBCA programs is available with three weeks’ notice. One caregiver accompanying a visitor with accessibility needs is admitted free. Breastfeeding and bottle-feeding are allowed in public spaces.
Getting to Gallery 2
Gallery and Forum Building entrance
The exhibition is in Gallery 2 at YBCA’s Gallery and Forum Building, whose main entrance is at 701 Mission Street. The separate Blue Shield of California Theater entrance is at 700 Howard Street.
YBCA lists public transit, car, bicycle and walking as ways to reach the campus, but its visit information gives no route-specific transit or parking instructions. The map links can calculate directions from your own starting point; parking details are not provided.
Rael San Fratello: Prototypes and Provocations - YBCA ↗ · Visit - YBCA ↗
Before you make a plan
When are the galleries open?
Wednesday, 11 a.m.–8 p.m.; Thursday–Sunday, 11 a.m.–5 p.m. Galleries are closed Monday and Tuesday.
What does general gallery admission cost?
YBCA lists $10 for adults 18 and older and $5 for students and seniors. Admission is free for youth 17 and under, military personnel, Museums for All visitors and members; Wednesdays are free for everyone.
Can visitors enter Sanctuary?
YBCA describes the structure and its building method but does not say visitors can enter or operate it. Check with the venue if access to the structure matters to your visit.
Which entrance serves the exhibition?
Use the Gallery and Forum Building entrance at 701 Mission Street. The 700 Howard Street entrance is for the separate theater.
Location & Google Maps
Gallery 2, Yerba Buena Center for the Arts (YBCA)
701 Mission Street, San Francisco, CA 94103
Map search by venue and address. Check the organiser’s entrance details before travelling.
