metachirality script, or idea-pile, because it kind of goes from an idea-pile to a story

that hopefully makes sense.

And anything not essential to that particular story is gonna get deleted.

So here's some examples of that.

Most of the time when people talk about symmetry they talk about discrete symmetries, like

this has symmetry when turned 72 degrees but not anywhere inbetween.

Unlike a circle which can turn an infinitely small amount and have symmetry.

But with continuous screw symmetry you can't just go any infinitely small amount around

and forward, it has to be in the right proportions.

So it kind of gets calculusy, like maybe you could describe the continuous symmetry using

the slope of the threads, or maybe use degrees of rotation per millimeter?

Things with continuous screw symmetry also, of course, have a discrete translation symmetry.

Move it forwards by the distance between threads and it looks the same.

And the foot thing has translation symmetry too, every five feet (or every 45 millimeters

if you want the metric conversion), and you wonder if you could avoid having that extra

symmetry and only have screw symmetry, but you'd have to not have the feet come back

around to the same spot, like, the angle between them can't add up to a multiple of 360 degrees

no matter how many times you add it together.

And you could do that by using an irrational angle so it never comes around to the same

spot, like a vine where the leaves grow at the golden angle around the stalk each time

and so it has golden angle screw symmetry only, no translation symmetry ever, which

means no leaves ever grow out of the same direction from the stalk and can get maximum

sunlight.

That's great because our foot tower deserves to grow and thrive in its natural state with

a plant-like symmetry that will allow it to flourish.

Anyway if you want to avoid extra symmetry, now you have to worry about symmetry the other

way, around a cross section.

Like this double helixy noodle has 2-way rotational symmetry, which you suppose is just part of

its double-helixy nature, while your other pasta has three way rotational symmetry on

a cross section so its a triplehelix.

And your drill bits seem to mostly have 2-way rotational symmetry so they're basically

just like rotini.

Speaking of 180 degree rotations, there is an exception to the metachirality of screw

symmetry, that's when it's a discrete screw turn of 180 degrees because then it's

the same to the right as to the left.

Or if you already have another symmetry on the cross section such as two-fold mirror

symmetry like in the kind of plants that grow opposite pairs of leaves and have a 90-degree

screw symmetry, well, now that 90-degree screw symmetry is the same both ways.

So whether an entire thing is metachiral depends on its whole group of symmetries, not just

each individual symmetry.

So screws and drill bits all have the same chirality because of convention, but what

about these things that have the opposite chirality though they're a little conical

but we'll ignore that for now, also some nice 5 and 6 fold rotational symmetry going

on, but these are called easy-outs and they go counterclockwise because they are for drilling

out bolts, like if the head of a bolt comes off and its stuck in something and you want

to get it out you can drill a hole in the bolt and then use one of these in there, and

it will grip and drill into the bolt while turning counterclockwise which will encourage

the bolt to turn counterclockwise and come out.

Also maybe something about the chirality of spiral staircases in castles and how to defend

your tower from invading swordsmen if you're left handed, and did you know very rarely

a person or animal will come out the opposite chirality, like their organs are the other

way round, and that's a different thing from right or left handedness?

So yeah those are my deleted scenes and there's some interesting stuff in there, I really

like the foot plant outside, but nothing in there is essential and my videos are art pieces,

it's not enough for something to be interesting, or funny, or cool, or educational.

It needs to be doing all of that, plus be essential to the storyline.

So most of my time is spent researching, writing, and editing the script.

And at the same time I'm doing that I'm planning and imagining what the visuals are going to

be.

And most of that stays in my head so I like to get to filming as soon as possible before

I forget the visuals I have in mind.

Filming usually only takes a day or two, but it's the most exciting part to watch so it's

a little overrepresented on my lens uploads.

So here are some of those that I managed to save from filming this video so you can see

what filming kinda looks like in real time rather than me narratizing after the fact

what I think filming is like.

Alright, it's 8am, I'm almost done setting up to film Metachirality Part 2, I just realized

I've got the wrong kind of pasta so, but I don't need that till the second half of the

video.

Well, the camera crashed mid-filming.

We're gonna hope it can recover the data.

So it looks like we didn't lose anythnig, though I'm gonna hunt around for another memory

card.

Not sure I have another memory card.

You will be seeing this one in the video.

I'm about a 5th of the way through the script, got a couple good hours of filming in, it's

time for second breakfast.

And your homework, if you want, is to fill out this diagram.

And there's our foot selfie.

I photoshopped the foot selfie to get me lots

of feet, just got a few more to cut out.

But first I'm gonna break for lunch.

*Noodles, noo-noodles, noo-noodles, noo-noodles*

Well I made a pile of feet, there's my pile of feet.

It's 8:30, I've almost finished setting up to film.

I've gathered my props, and I was gonna pre-drill the holes through the feet but now that I'm

looking at these drill bits I think I have to spend a little time re-writing, cuz these

have to be in the video.

Edited my script, I think the drill bits are gonna make better examples than the one I

had, so I'm happy about that.

I also had the idea to try welding rod instead of pipe cleaner.

It'll be stiffer but still has this nice texture so the feet will keep their angle.

But now it's time for 2nd breakfast!

I didn't have the right size drill bit because these ones keep breaking so I borrowed this

beautiful shiny set and I'm so jealous of it and I want one.

But yeah, that size worked perfectly.

I'm about two-thirds of the way through filming now.

I really like how my foot staircase came out.

And now it's time for lunch.

Guess what's for lunch.

*Noodles noo-noodles, noo-noodles, noo-noodles*

It's 5:40 and I just finished filming which is good cuz I have to leave in a minute.

I wasn't sure I was gonna get the rest of the filming done today but I'm glad I did

so I can edit tomorrow!

Ya I had to do things like make this pastakitty.

It was important.

So yea those are the filming-day lens clips, and Lens is a patron-only thing where I can

upload short clips, people can see what I'm working on and, yknow, where their money's

going.

And they disappear after 24 hours.

So it's very low-pressure, I can just share whatever.

After I film then I record my narration and I edit the footage to the narration.

And I don't use stop-motion, some people think I do.

I film it all in real time and I end up with many hours of footage.

For this video it's about 7 hours of footage.

And that's because I want to be able to get really granular about how I edit and what's

in real time and what's not.

Because I usually use a lot of temporal texture, where things being in real-time or sped-up

or how I make the transitions (or lack of transition), that's all part of the flow of

the scene.

And I'm very picky about that.

I'll also mention: I do a lot of reading out loud of my script while I'm writing, which

helps in editing and getting a feel for how it's flowing.

And that helps, come time to record the narration because I've already basically been practicing

for a week or more.

It's great to be both writing and acting the narration because I'm very picky about how

I want the words to be expressed and pronounced and the cadence of the narration.

So.

Unlike this video, which is rambled in real-time.

Ok that's it!

Bye!