Uploaded December 2021 | Updated September 2026, 2 weeks ago

---

Part II of everyone's favourite 500-LED xmas tree! Thanks to Jane Street. Check out their programs: janestreet.com/join-jane-street/our-programs

Check out Ben Sparks’s campaign video on how the GeoGebra file was made! youtu.be/1KQ0NccasRA

And here is what you came for, the Harvard github with details on how to send me your effects as a CSV file. github.com/GSD6338/XmasTree

In short: each line of the CSV starts with a frame number and then R, G, B values (one 'column' each) for all of the LEDs in sequence. (You can see examples in the Harvard github.) Send them in by 09 January 2022 either directly on the standupmaths GitHub or email to matt+LEDs@standupmaths.com

You can get my tree's coordinates in GIFT format as either a CSV:
dropbox.com/s/lmccfutftplhh3b/coords_2021.csv?dl=0
Or a TXT file in the old format from last year:
dropbox.com/s/xkb55tzdsxb07m4/coords_2021.txt?dl=0

Plus I've put my auto-correcting code from this video up on my github (along with the GIFT coordinates). github.com/standupmaths/xmastree2021

Thanks to all of my Patreon supporters who keep my LED habit alive. You too can help support me: patreon.com/standupmaths

CORRECTIONS:
- Yes, I say "squared" twice instead of "cubed". But I was thinking "cubed". You know I was.
- Not actually "within 10%" but actually I was off by 11.8%. Close enough.
- Let me know if you spot anything else wrong!

Filming and editing by Alex Genn-Bash
Terrible code by Matt Parker
SUM Music by Howard Carter
Design by Simon Wright and Adam Robinson

MATT PARKER: Stand-up Mathematician
Website: standupmaths.com
US book: penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker
UK book: mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback