2025 π Day latest news buy art
Love itself became the object of her love.Jonathan Safran Foercount sadnessesmore quotes
very clickable
visualization + math

π Day 2025 Art Posters - TTCAGT: a sequence of digits
 / Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca buy artwork
2025 π DAY | TTCAGT: A sequence of digits. 768 digits of `\pi` as a Sanger sequencing trace of 1,536 peaks. Decode the sequence (BUY ARTWORK)

`\pi` Day 2020 Art — Digits, poetically.


Pi Day 2020 Art - Digits, poetically.
 / Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
2024 π DAY | Explore the garden of digits.

Pi Day 2020 Art - Digits, poetically.
 / Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
2023 π DAY | Repeated sequence

Pi Day 2020 Art - Digits, poetically.
 / Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
2022 π DAY | three one four: a number of digits

Pi Day 2020 Art - Digits, poetically.
 / Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
2021 π DAY | Good things grow for those who wait.' edition.


Pi Day 2020 Art - Digits, poetically.
 / Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
2020 π DAY | The piku.

Pi Day 2020 Art - Digits, poetically.
 / Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
2019 π DAY | Hundreds of digits, hundreds of languages and a special kids' edition.

Pi Day 2020 Art - Digits, poetically.
 / Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
2018 π DAY | Street maps to new destinations.

Pi Day 2020 Art - Digits, poetically.
 / Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
2017 π DAY | Imagine the sky in a new way.


Pi Day 2020 Art - Digits, poetically.
 / Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
2016 π APPROXIMATION DAY | What would happen if about right was right.

Pi Day 2020 Art - Digits, poetically.
 / Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
2016 π DAY | These digits really fall for each other.

Pi Day 2020 Art - Digits, poetically.
 / Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
2015 π DAY | A transcendental experience.

Pi Day 2020 Art - Digits, poetically.
 / Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
2014 π APPROXIMATION DAY | Spirals into roughness.


Pi Day 2020 Art - Digits, poetically.
 / Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
2014 π DAY | Hypnotizes you into looking.

Pi Day 2020 Art - Digits, poetically.
 / Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
2014 π DAY | Come into the fold.

Pi Day 2020 Art - Digits, poetically.
 / Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
2013 π DAY | Where it started.

Pi Day 2020 Art - Digits, poetically.
 / Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
CIRCULAR π ART | And other distractions.

On March 14th celebrate `\pi` Day. Hug `\pi`—find a way to do it.

For those who favour `\tau=2\pi` will have to postpone celebrations until July 26th. That's what you get for thinking that `\pi` is wrong. I sympathize with this position and have `\tau` day art too!

If you're not into details, you may opt to party on July 22nd, which is `\pi` approximation day (`\pi` ≈ 22/7). It's 20% more accurate that the official `\pi` day!

Finally, if you believe that `\pi = 3`, you should read why `\pi` is not equal to 3.

Most of the art is available for purchase as framed prints and, yes, even pillows. Sleep's never been more important — I take custom requests.
3 Little `\pi`,
1 what
4 can you tell us?

Welcome to this year's celebration of `\pi` and mathematics. Among the chaos of COVID-19, this year `\pi` Day celebrations are short poetic emissions I call “piku”. They are brief pauses for the time.

Start by reading how piku are constructed and then browse submitted piku. Consider participating by submitting your own piku. All you need is a pen and a few (small) words. Very therapeutic.

But if the words here don't help, immerse yourself in my coronavirus art. It's quite catching.

If you enjoy poetry and words, see how I convert spam into poems in the style of ee cummings and if you like to see words arrange on page, look through my typographic art.

Contribute by tweeting your #piku creation for #piday. Or email me.

contributed piku

3 Circles and
1 Lines
4 Unified. `\pi`!
Cath Ennis via twitter

To fully grok the next set of piku, you need to know something about the Feynman Point.

3 Nine nine nine
1 nine
4 nine nine and so
1 on.
Paulina Rowicka via twitter

3 Feynman point
1 at
4 seven six two.
Paulina Rowicka via twitter

3 Feynman point
1 is
4 six nines in `\pi`.
Paulina Rowicka via twitter

3 Next reply
1 to
4 follow quite soon.
Paulina Rowicka

3 Birds on wa-
1 -ter
4 A parking lot
1 Walk
5 on grey Step on a
9 crack; cement paw prints; immortalized
2 Break mom's
6 back grey green, yellow, red
5 green creeping up the
3 chain-link fence
5 the promise of rain
8 spots of moss abandoned mattress
9 quiet aesthetic terror; mountains
Viorica Hrincu

3 Point and click
1 click
4 click and submit
1 and
5 wheels go up, I down
9 Rollover, double tap, search engine
2 growling
6 Open tab, scroll to load
5 Click click click accept
3 Submission
5 Wait wait wait waiting
8 Trace the route in milliseconds
9 Longer waits acceptable if some
7 Not yet defined condition
9 Satisfied among these falsetruehoods

my piku

3 Piku are
1 brief
4 pauses just in
1 time.

3 Three one four
1 One
4 Five nine two six.

2 Roughly
2 the same
7 is frequently good enough.

6 Two times by anyone
2 equals
8 one time by anytwo, I hope.

3 Numbers act
1 we
4 are the audience

3 Body a
1 shell.
4 Mind a pearl with
1 in.

3 Land meets sky.
1 Oh,
4 It's you again!
1 Yes,
5 Who did you expect?

3 The sky is
1 full
4 but makes space for
1 us.

3 No no no,
1 yes.
4 You make up my
1 mind

3 Gone crazy,
1 now
4 going viral.

3 Life is long,
1 but
4 some parts are short.

3 Memories
1 for-
4 get yourself then.

3 Pain to feel,
1 more
4 than you can see.

3 Hot air breeze
1 cools
4 much hotter things.

3 F 0 0
1 red
4 You add the light.

3 All I hear
1 is
4 this corona.

3 Contact lost
1 alone
4 blurry faces
1 far
5 on the horizon.

3 Pi never
1 ends
4 unlike outbreaks.

3 Reason on
1 brain
4 kindness in heart.

3 Unknown ends
1 un-
4 known beginnings
1 start.

3 Ducks on pond
1 paired
4 except this one.

3 Words chase words
1 then
4 period like this
1 one.

A series based on `\pi`, `e`, the natural logarithm, and `\phi`, the Golden ratio.

3 This orbit
1 dance
4 no basic step.
2 Adding adding,
7 more more more still still still not
1 enough.
1 Ideal,
6 geometry, and then
1 you.

my nku

1 Dust
4 in space vacuum
0
3 clogs alien
2 machines.
0
2 Bummer.
0

news + thoughts

Happy 2025 π Day—
TTCAGT: a sequence of digits

Thu 13-03-2025

Celebrate π Day (March 14th) and sequence digits like its 1999. Let's call some peaks.

Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
2025 π DAY | TTCAGT: a sequence of digits. The digits of π are encoded into DNA sequence and visualized with Sanger sequencing. (details)

Crafting 10 Years of Statistics Explanations: Points of Significance

Sun 09-03-2025

I don’t have good luck in the match points. —Rafael Nadal, Spanish tennis player

Points of Significance is an ongoing series of short articles about statistics in Nature Methods that started in 2013. Its aim is to provide clear explanations of essential concepts in statistics for a nonspecialist audience. The articles favor heuristic explanations and make extensive use of simulated examples and graphical explanations, while maintaining mathematical rigor.

Topics range from basic, but often misunderstood, such as uncertainty and P-values, to relatively advanced, but often neglected, such as the error-in-variables problem and the curse of dimensionality. More recent articles have focused on timely topics such as modeling of epidemics, machine learning, and neural networks.

In this article, we discuss the evolution of topics and details behind some of the story arcs, our approach to crafting statistical explanations and narratives, and our use of figures and numerical simulations as props for building understanding.

Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
Crafting 10 Years of Statistics Explanations: Points of Significance. (read)

Altman, N. & Krzywinski, M. (2025) Crafting 10 Years of Statistics Explanations: Points of Significance. Annual Review of Statistics and Its Application 12:69–87.

Propensity score matching

Mon 16-09-2024

I don’t have good luck in the match points. —Rafael Nadal, Spanish tennis player

In many experimental designs, we need to keep in mind the possibility of confounding variables, which may give rise to bias in the estimate of the treatment effect.

Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
Nature Methods Points of Significance column: Propensity score matching. (read)

If the control and experimental groups aren't matched (or, roughly, similar enough), this bias can arise.

Sometimes this can be dealt with by randomizing, which on average can balance this effect out. When randomization is not possible, propensity score matching is an excellent strategy to match control and experimental groups.

Kurz, C.F., Krzywinski, M. & Altman, N. (2024) Points of significance: Propensity score matching. Nat. Methods 21:1770–1772.

Understanding p-values and significance

Tue 24-09-2024

P-values combined with estimates of effect size are used to assess the importance of experimental results. However, their interpretation can be invalidated by selection bias when testing multiple hypotheses, fitting multiple models or even informally selecting results that seem interesting after observing the data.

We offer an introduction to principled uses of p-values (targeted at the non-specialist) and identify questionable practices to be avoided.

Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
Understanding p-values and significance. (read)

Altman, N. & Krzywinski, M. (2024) Understanding p-values and significance. Laboratory Animals 58:443–446.

Depicting variability and uncertainty using intervals and error bars

Thu 05-09-2024

Variability is inherent in most biological systems due to differences among members of the population. Two types of variation are commonly observed in studies: differences among samples and the “error” in estimating a population parameter (e.g. mean) from a sample. While these concepts are fundamentally very different, the associated variation is often expressed using similar notation—an interval that represents a range of values with a lower and upper bound.

In this article we discuss how common intervals are used (and misused).

Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
Depicting variability and uncertainty using intervals and error bars. (read)

Altman, N. & Krzywinski, M. (2024) Depicting variability and uncertainty using intervals and error bars. Laboratory Animals 58:453–456.

Nasa to send our human genome discs to the Moon

Sat 23-03-2024

We'd like to say a ‘cosmic hello’: mathematics, culture, palaeontology, art and science, and ... human genomes.

Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
SANCTUARY PROJECT | A cosmic hello of art, science, and genomes. (details)
Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
SANCTUARY PROJECT | Benoit Faiveley, founder of the Sanctuary project gives the Sanctuary disc a visual check at CEA LeQ Grenoble (image: Vincent Thomas). (details)
Martin Krzywinski @MKrzywinski mkweb.bcgsc.ca
SANCTUARY PROJECT | Sanctuary team examines the Life disc at INRIA Paris Saclay (image: Benedict Redgrove) (details)
Martin Krzywinski | contact | Canada's Michael Smith Genome Sciences CentreBC Cancer Research CenterBC CancerPHSA
Google whack “vicissitudinal corporealization”
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