I’m an application developer by day, but lately Claude Code and Codex have final...

pastel8739 · 2026-05-11T06:22:40 1778480560

This is super cool. At first I thought the “tank” on top was filled with water—I wonder what it would look like if it were

_def · 2026-05-10T20:18:30 1778444310

any details on the display itself?

paulnovacovici · 2026-05-10T20:25:21 1778444721

Display is part of a dev kit EPS32-s3, and the holographic part is an illusion called “peppers ghost”

mikestorrent · 2026-05-10T20:34:35 1778445275

Beautiful piece of kit. I have no idea how it works from looking at it, fantastic. Please do post a full writeup on it.

narmiouh · 2026-05-10T21:35:19 1778448919

Its a pretty straight forward technique, the display is at the bottom and in the glass cube there is a mirror at 45 degree angle facing you (you can see the mirrors edge on the side wall) which reflects the image from the display at the bottom making it look like a hologram

danparsonson · 2026-05-10T23:31:41 1778455901

You can create the same effect on a smart phone screen with a video like this: https://m.youtube.com/watch?v=CIszi2Kv_lk and a some clear plastic sheet put together like this: https://www.twowaymirrors.com/wp-content/uploads/2019/11/pep...

OP: beautiful work with your surf projector!

paulnovacovici · 2026-05-11T03:11:06 1778469066

Yup! We first started very similar with a phone and testing out the illusion then moved over to a microcontroller for a little nightstand device

deskamess · 2026-05-11T12:06:40 1778501200

Do you happen to have instructions on how to build the plastic sheet setup or perhaps a pointer to something that I can buy?

danparsonson · 2026-05-11T13:32:31 1778506351

You can do it by cutting and folding a sheet of clear acetate or similar from a net like this: https://wp.optics.arizona.edu/oscoutreach/wp-content/uploads...

Or you could cut the four sides separately and just sellotape them together.

edit: not much help without measurements sorry - try this: https://www.holeinthewallgang.org/Customer-Content/www/CMS/f...

The required angles appear to be 54 or 126 degrees: https://data.formsbank.com/pdf_docs_html/304/3049/304991/pag...