Introducing the Curiosity Box Fluid Dynamics Project: a dual-chamber bottle that lets kids see fluid science in action.
It holds two different liquids in two completely separate chambers, but you get to choose which one pours out. How? With nothing more than science itself. By using your thumb to control the pressure in each chamber, you can play with Pascal's principle and choose which liquid to pour.
It’s a hands-on way to explore how air pressure, gravity, and fluid flow really work—the same principles first discovered by ancient scientists like Pythagoras, Archimedes, and Pascal.
Use it as a simple classroom demo, a fun physics experiment, and just a clever bottle that lets you carry two drinks at once.
Beginner TIER
- Dual chamber water bottle
- Unique P3M1 logo sleeve
- Free PDF worksheet and lessons on fluid dynamics
- Schrödinger’s cat water bottle
- Unique P3M1 logo sleeve
$79.90
Intermediate TIER
- Dual chamber water bottle
- Asteroids sleeve
- Braids sleeve
- Unique P3M1 logo sleeve
- Free PDF worksheet and lessons on fluid dynamics
$99.90
Expert TIER
- 2 dual chamber transparent bottles with different designs (perfect for siblings)
- Knight’s Tour sleeve
- Asteroids sleeve
- Braids sleeve
- Unique P3M1 logo sleeve
- 2 x mini posters
- Free PDF worksheet and lessons on fluid dynamics
$185
Beginner Assassin
- Schrödinger’s cat water bottle
- Unique P3M1 logo sleeve
Dual chamber water bottle
Unique P3M1 logo sleeve
Free PDF worksheet and lessons on fluid dynamics
$79.90
INTERMEDIATE ASSASSIN
Dual chamber water bottle
Asteroids sleeve
Braids sleeve
P3M1 logo sleeve
Free PDF worksheet and lessons on fluid dynamics
$99.90
Intermediate Assassin
- Asteroids sleeve
- Braids sleeve
- Steve Mould mini poster
- Schrödinger’s cat water bottle
- Unique P3M1 logo sleeve
$85
PRE-ORDER
Expert Assassin
2 dual chamber bottles with different designs (perfect for siblings)
Assassin’s water bottle
Schrodinger’s cat water bottle
Knight’s Tour sleeve
Asteroids sleeve
Braids sleeve
P3M1 logo sleeve
Free PDF worksheet and lessons on fluid dynamics
$185
BEHIND THE SLEEVES
BRAIDS
In math, there’s a famous idea called Alexander’s Theorem: it says that every knot — no matter how tangled — can be rearranged into a closed braid. That means the knot can be shown as a set of strands all looping around in the same direction without turning back.
This sleeve shows that idea in action: smooth twisting braids that hint at how mathematicians “tame” complicated knots by turning them into beautiful, orderly patterns. It’s science you can actually hold in your hand.
KNIGHT'S TOUR
If you place a knight on an empty chess board, it’s possible to visit every square on the board exactly once and end up back where you started, only making legal knight moves. That’s called a knight's tour. It works for an 8x8 grid of squares but it’s not guaranteed for other sizes of board.
KNIGHT'S TOUR
A knight in chess moves in a special L-shape — and mathematicians discovered something amazing about it. If you start with a single knight on an empty 8×8 board, it’s actually possible to visit every single square exactly once and return to where you started, using only real knight moves.
This path is called a knight’s tour, and it’s a famous problem in mathematics and computer science. It works beautifully on a standard chessboard, but on boards of other sizes the trick doesn’t always work — some grids simply can’t be toured.
The sleeve shows this elegant, looping path, turning a classic math puzzle into a pattern you can carry around.
ASTEROIDS
In the classic arcade game Asteroids, your ship can fly off the left side of the screen and pop back in on the right — and the same happens top-to-bottom. That means the game world isn’t really a flat screen at all.Mathematically, that “wrap-around” behavior makes the Asteroids universe topologically the same as a cylinder (or a torus, depending on how you connect the edges).
So we printed this design on an actual cylinder turning a video-game universe into a piece of real-world math you can hold.
P3M1 WALLPAPER
If you cover a flat surface with a repeating pattern—like a wallpaper—math says there are only 17 possible ways the pattern can repeat using symmetry. These are called the 17 planar symmetry groups, and they’re like the “rules” for how repeating designs can fit together perfectly.
One of the prettiest and most playful of these groups is p3m1, with repeating triangles and mirror lines that create a pattern that feels both orderly and surprising.
That’s why we chose it for this sleeve: it’s a little piece of wallpaper math wrapped around your bottle.
P3M1 WALLPAPER
There are only 17 different wallpapers. Which is to say, there are only 17 planar symmetry groups. My favorite is called the p3m1 group, which is almost what is shown on this logo sleeve.
Meet the Minds Behind the Bottle
Steve Mould
co-creator
Michael Stevens
co-creator
FAQ
