Start Here
338 builds is a lot. These 15 are the ones that started it all — the builds that defined what Junkyard Genius is. If you're new, this is your launchpad.
The Essentials
#001
Plasma Tornado Lamp
A swirling column of plasma trapped in glass — where it all began
A swirling column of plasma trapped in glass — part mad science, part living room art piece.
#002
Lichtenberg Wood Burner
Fractal lightning burned into wood at 2,000 volts
High voltage from a microwave transformer burns fractal lightning patterns into wood — nature's art, delivered at 2,000 volts.
#003
Propane Vortex Cannon
A trash can that shoots flaming vortex rings across the yard
A trash can that shoots flaming vortex rings across the yard — part physics demo, part backyard artillery.
#007
Fire Tornado Table
Mesmerizing tabletop fire tornado — dead simple to build
A lazy susan, some mesh screen, and a fuel source — spins up a mesmerizing tabletop fire tornado on demand.
#008
Plasma Speaker
The speaker cone is literally lightning
A flyback transformer modulates an electrical arc to play music — the speaker cone is literally lightning.
#009
Rubens' Tube
Sound waves visualized as a dancing wall of fire
A gas-filled tube with a row of holes shows standing sound waves as a dancing wall of fire — the most elegant physics demo ever built.
#010
Ultrasonic Levitator
Actual levitation with ultrasonic transducers — no tricks
Ultrasonic transducers create standing waves that trap and levitate small objects in mid-air — actual levitation, no tricks.
#024
Electric Go-Kart
Bed frame + scooter motor = 30 mph
A scooter motor, a bed frame, and some batteries walk into a garage. They don't walk out — they drive out at 30 mph.
#042
Grape Plasma
Plasma from a grape. Seriously.
Cut a grape almost in half, microwave it, and watch plasma balls form where the halves connect. The simplest plasma demonstration in existence.
#044
Anti-Gravity Water Fountain
Strobe-synced water droplets that appear frozen — or flowing upward
A strobe light synchronized to falling water droplets makes them appear frozen in mid-air — or even flowing upward. Pure optical illusion, zero Photoshop.
#046
Ferrofluid Mirror
A magnetic liquid that spikes, morphs, and dances like a living creature
An array of electromagnets behind glass controls a pool of ferrofluid — a magnetic liquid that spikes, morphs, and dances like a living creature. The most hypnotic display you can build.
#166
DIY Neon Sign
Bend glass, fill with gas, apply voltage — real neon
Bend glass tubing, fill with gas, seal, and apply high voltage — real neon glows orange, argon glows purple. Hand-bent custom neon signs.
#312
Kinetic Sand Table
A hidden magnet draws infinite geometric patterns in sand
A hidden magnet beneath glass drags a steel ball through sand, drawing infinite geometric patterns in silence. A Zen garden that draws itself.
#330
Cloud Chamber Coffee Table
A coffee table that visualizes cosmic radiation in real time
A functioning particle physics detector built into a coffee table — watch cosmic rays from deep space while you drink your morning coffee.
#338
Mechanical Flip-Dot Display
256 electromagnetic pixels — like an old airport departure board you built yourself
A grid of 256 electromagnetic pixels that physically flip between black and yellow with a deeply satisfying cascading CLICK — the soul of old airport departure boards, built from scratch.
Want_More?
These 15 builds are just the beginning. There are 338 total builds across 33 categories waiting to be discovered.