Here’s a whirlwind tour of some of my favorites. On that list are a POV holographic display, giant cast-resin LEDs, an optical-pump ruby laser built out of parts from AliExpress, blinky goodness ...

Here’s a whirlwind tour of some of my favorites. On that list are a POV holographic display, giant cast-resin LEDs, an optical-pump ruby laser built out of parts from AliExpress, blinky goodness ...

To create this effect, the team directed a high-power green laser through a ruby crystal and illuminated it perpendicularly with a blue laser. When the green laser interacted with the ruby ...