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Adults Only (18+)
Note: The Tactile Dome and some programs have limited capacity and are available to visitors on a first-come, first-served basis.
Lose yourself in over 650 interactive exhibits exploring perception, art, and science at our adults-only After Dark. Grab your friends and a drink and get immersed in mind-bending experiences and unique, thought-provoking programs.
Feeling a little irrational? How about transcendental? Excited to taste some math puns? Don’t miss the Exploratorium’s favorite holiday—after all, we made it up—and make sure to taste some savory, sweet, and mathematically specific baked goods at Pairings: Pie. Mmmmm, circle constants!
6:00 p.m. | Gallery 2
Come get a slice of π Day celebration while supplies last!
Pie-Making for Geeks
With Three Babes Bakeshop
7:00 and 8:00 p.m. | Gallery 4
Pie-loving nerds, take this opportunity to ask the experts—the professional bakers of Three Babes Bakeshop—all your burning pie questions. Or your questions about not burning pie. Could go either way.
With Loretta Keller, Julie Yu, and Clay Reynolds
7:00 p.m. | Fisher Bay Observatory Gallery 6
Please note: Seating and tastings for Pairings are limited to 120 ticketed guests. Pick up your free ticket at the Observatory.
Are you flaky? Full of it? Not too sweet? You may not very popular—but you’d make a great pie. This Pi Day, experience the best of pie in both the gastronomical and mathematical senses. First, get tips and tricks on the art and science of pie crust with chef Loretta Keller. Then do some kitchen calculations with Exploratorium scientist Julie Yu and find out how pi can help you on the way to improved pie. Finally, become a better and more intuitive bartender by learning to use the “golden ratio of cocktails” with beverage expert Clay Reynolds and get a taste of his aquavit gimlet cocktail to go with your lemon-curd pie.
With Ron Hipschman and Lori Lambertson
7:30 p.m. | Bechtel Gallery 3, Webcast Studio
Find out what’s so special about the famous mathematical constant. Exploratorium educators and π enthusiasts Lori Lambertson and Ron Hipschman will also demonstrate the unique properties of this irrational number.
Pi: The Story of an Extra Little Bit
With Paul Dancstep
8:00 p.m. | Osher Gallery 1, Kanbar Forum
Pi is just a little bit bigger than three. But exactly how much bigger? For over 2,000 years, human beings having been coming up with ingenious schemes to find out. This animated talk explores some of these methods, from the ancient "polygon method" of Archimedes to the psychedelic formulas of Ramanujan to modern computer algorithms, which have been used to determine pi to an accuracy of over 22 trillion decimal places.
Exploratorium π Day Band
With Mission Delirium
9:00 p.m. | Roaming
In the spirit of the origin of the holiday, stir up the energy of our space in a clockwise rotation. With circular horns and drums, the Exploratorium π Day Band will party ‘round the building, spreading revelry as they go.
With the Tinkering Studio
6:00–8:30 p.m. | Gallery 2, Tinkering Studio
In celebration of Pi Day, local maker-educators will build a pi-themed chain reaction and share the finale with After Dark.
Cutting π and Stringing π
6:30–9:30 p.m. | Bechtel Gallery 3 Explainer Station
Join the Explainers for a hands-on exploration of π and its properties. With just a few simple materials, you can wrap your head around how this constant works.
7:00–10:00 p.m. | Osher Gallery 1
Circles surround us in nature. To describe them, we use the number π, or the ratio of a circle’s circumference to its diameter: 3.14159…. Join the Explorables team to approximate this elusive number by tossing toothpicks onto a lined surface—and counting how many fall across the lines.
Osher Gallery 1
Journey through total darkness in this twisting, turning, tactile sculpture. Walk, crawl, climb, and slide your way through a wonderland of textures using only your sense of touch as a guide.
Please Note: Due to the nature of this experience, certain restrictions apply. Guests who are afraid of the dark; claustrophobic; have back, neck, or knee injuries; or are in their third trimester of pregnancy should not participate. Guests wearing casts are prohibited. Also, please wear comfortable clothes.
You can reserve tickets for our 6:15 and 7:00 p.m. sessions. We also operate drop-in, first-come, first-served sessions at 7:45, 8:30, and 9:15 p.m.; tickets can be purchased at the Information Desk.
Learn more about the Tactile Dome.
6:00–9:45 unless noted
Various locations throughout the museum
Ticketing at 6:00 p.m., first come, first served
Osher Gallery 1
Draw hypnotically flowing patterns with a swinging table, and watch friction cause the patterns to slowly shrink along a spiral path. Pick up a ticket to reserve your spot in line for this popular activity.
Bechtel Gallery 2
Tune in to surrounding sounds by experimenting with strings and vibrations, and use electromagnets to build a basic speaker. Learn how to listen with your bones, and explore the workings of the inner ear.
Cow Eye or Flower Dissection (alternating)
Do cows see color? How does a lens work? Examine the intricate structure of a cow eye to learn about similar structures in our own eyes, as well as some key differences.
Stigma, stamen, pistil, anther, style: Uncover the beautiful architecture of flower anatomy, and gather some surprising strategies that plants use to reproduce.
Osher Gallery 1
Everything is not as it seems—at first. Pick a card, any card, and watch the Explainers reveal some surprising aspects of human perception.