If you had an array of high power addressable LEDs, how would you project them onto a wall? Perhaps you’d use a Fresnel lens, or maybe an individual lens on the top of each. [Joo] faced this problem ...

Fascinated with rockets? How about making it glow to make it more cool and appealing. All you need to have is just an ample of time to make it happen. There are simple instructions on how to assemble ...