I made a venn diagram to help you understand Moiré patterns.
I tried to make an animated version, but lots of closely placed lines at an angle close to vertical or horizontal already create Moiré patterns, so it defeated the purpose.
well that got popular. thanks for al the "that's a moire" jokes 🎵

can't believe nobody did:

What’s that thing in the reef
With the big shiny teeth?
That’s a Moray!

It's a Moray, Parody Song Lyrics of Dean Martin, That's Amore

It's a Moray. Parody song lyrics for the song That's Amore by Dean Martin

amIright

@bit101

When an eel has a jaw
With another inside,
that's a Moray?

@bit101 when I saw the number of replies to your toot I immediately /knew/ people were making "that's a moire" jokes!
I had to mute my mastodon tab, too many likes and boosts, ping, ping, ping.
OK, I've had enough. No Moiré puns!
@bit101 Technically it’s only called moiré when it comes from the Moire Valley region, otherwise it’s just sparkling interference.
@db a third of a way through that sentence I was getting annoyed. Then I was laughing. :)
@bit101 I ducked preemptively :)

@db @bit101 I'm going to have to duck for this one... :ahem:

🎤 🎵When the patterns combine in a manner sublime, that's a moire! 🎵

@db @bit101 ahh dang. Should have known someone else would beat me to it. This delayed post loading is... Oh well. LOL
@db @bit101 the people in that town dress horribly: the 60’s left a long time ago, but they never got the memo.
Well, that's my most popular post of 2026 out of the way. I can coast for the rest of the year.

ok, I got one.

What you eating young fellow?
Crackers, chocolate, marshmallow...
That s'more, eh?

@bit101 @elverkonge That's a very good one.
@bit101
When a grid's
Misaligned
With another behind
That's a moire
-Randall Munroe

@madengineering @bit101 Or

When two grids passing by
Cast a pattern in your eye
That's a Moiré

@bit101

I always thought Dean Martin best described this:

When the moon hits your eye
Like a big pizza pie, that's a Moiré
When the world seems to shine
Like you've had too much wine, that's a Moiré

@bit101

🎶 When you take angled lines,
And different angled lines,
That a Moiré 🎶

@bit101

"When your patterns combine
in a way serpentine
that's a moire."

"With the high price of feed
It's for farmers in need
That some mow hay"

"If 'King Kong' has gone flat
Rent the flick 'Vampire Bat'
It's some More Wray"

@Jon_Kramer @bit101 cudos for the last one! 😂

@docwu @bit101 I used to know dozens of these. I still know more...

"A Canadian I know
Intros his mother and goes
That's my Maw, eh."

"A New Zealander man
With a permanent tan,
That's a Māori."

"When swimming in the sea
if a serpent bite your knee
That's a Moray."

@docwu @bit101

He's a card, he's a ham,

His last name's Amsterdam

He's a Morey."

Credit goes to Spider Robinson for creating this trend, in his books about Callihan's Tavern.

@Jon_Kramer

I did not have Morey Amsterdam on today's bingo card. Good job.   

@docwu @bit101

@Jon_Kramer @docwu @bit101

when an eel's swimming by
and it bites out your eye,
it'a a moray!

@bit101

The greatest Venn diagram of all time.

@bit101 when a grid's misaligned, with another behind, that's a moire~

@bit101 @agturcz you know that song

When an angled line
Meets another angled line
That's a'moiré

@bit101 When the joke is set up
randos make lyric posts, that's a fedi
@bit101 The Moiré You Know!

@bit101

When I was a kid my dad would bring home transparent discs that would create a Moiré pattern when overlaid and turned.

He also brought home other cool science stuff, like magnets and iron filings and chemicals. He was a scientist.

@Quasit sounds like a cool dad, too.

@bit101

He was the kindest man I have ever known. And he had a great sense of humor. I'm smiling just remembering him!

@bit101
How fun...
The moreeè the merrier

@bit101

Lot's of stanzas of "That's a Moir\'e" in the replies, but no-one's yet done

When new lines hit your eye
From two grids as they ply

@bit101 @mcc When your lines overlie and interfere in your eye, that’s a moiré!
@bit101 anti aliasing on the rescue~
@bit101 this is the most creative use of a ven diagram I've seen.
@bit101
When a grid's misaligned
With the one that's behind
That's a Moiré
@bit101 One Moiré for ya
@bit101 that is right up there with the pie chart that is actual pie, well done.

@bit101

When the lines're alligned
but not perfectly, you'll find
That's a moirée