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Draw an iceberg and see how it will float

xg15
14 replies
1d9h

Got a bit frustrated because I couldn't get anything except a flat surface above the water, then read the tweets below and realised that's the entire point:

https://threadreaderapp.com/thread/1362557149147058178.html

(Many thanks to Elon for making it impossible to read more than the first tweet on x.com without an account...)

ajb
6 replies
1d8h

Here's a non-flat one:

https://imgur.com/a/7KANxOn

Very unlikely to occur in nature I guess :-)

xanderlewis
4 replies
1d8h

https://ibb.co/ZLYxr4x

Sometimes to innovate you have to think like a child — or a teenager.

rvnx
0 replies
1d7h

Make sure to patent it before they use this as base design for the Cybertruck^2

isoprophlex
0 replies
1d5h

Nice tip on that iceberg

barfbagginus
0 replies
1d5h

I was about to post something similar. But you nailed it before I could swing my own hammer, to use a figure of speech.

barfbagginus
0 replies
1d5h

I was about to post something similar. But you nailed it before I could swing my own hammer, to use a figure of speech.

manwe150
0 replies
15h37m

That works, but my personal favorite is drawing something like 2 half notes, connected, since a bridge shape seems to maximize the height*width of iceberg visible above the water. There is nothing to stop you from just adding a wide flat plane to the top of your spike either though to add more flair!

HarHarVeryFunny
1 replies
1d2h

My mental model is of each side (think left/right in 2-D) of the iceberg competing with the other side to float to the surface by rotating the iceberg around it's center of gravity. The only stable positions are where these left/right rotational forces are balanced.

If an iceberg is currently floating in a vertical orientation where more of it's mass to one side of it's center of gravity (bottom half) is underwater compared to the mass on the other side (top half), then it's going to tend to rotate until both sides are equally above water, so (depending on mass distribution) horizontal orientations are likely to win over vertical ones.

Of course an iceberg could balance vertically, but that's like balancing a pencil on your finger - not the most stable, and any disturbance (such as the initial calving event) is likely to rotate it into a more stable horizontal orientation.

Sharlin
0 replies
21h29m

That’s exactly it. An iceberg can’t stay "vertical" for the exact same reason that a pencil can’t stay vertical. Even if perfectly balanced, the equilibrium is unstable.

furyofantares
0 replies
23h37m

Hexagons work

WhitneyLand
0 replies
1d2h

Try something that has no flat surfaces. For example a five pointed star.

RobertRoberts
0 replies
23h26m

I drew an equilateral triangle and it floats flat on top.

joshdata
6 replies
1d6h

Author here. Glad to see this making the rounds again after a few years.

Go science! Support your local climate scientist!

_Microft
2 replies
1d4h

This is very cool.

I found shapes that do not work well with the simulation: a very wide and narrow shape (like a needle) oscillates wildly and does not seem to stop or to even slow down.

hackernewds
0 replies
19h16m

what do you expect instead?

cinntaile
0 replies
12h21m

You have possibly unlocked the secret to infinite energy.

cscurmudgeon
1 replies
1d1h

Great education simulation! Thanks for working on this.

Curious about this: I am hitting a boundary-condition like behavior drawing a straight line at a 45 degree angle similar to the sibling comment.

Curious if it is due to physics or due to the simulation.

joshdata
0 replies
22h49m

I am pretty sure it's the simulation.

jackspratts
0 replies
1d

nice job. these simulations are 2d. does 3d make a difference? i'm almost about to start carving styrofoam to see.

- js.

amelius
4 replies
23h55m

How do we know there is only 1 stable position?

(A perfect circle would have many, but you could consider that a degenerate configuration.)

eternauta3k
3 replies
23h50m

There isn't necessarily just one. A rectangle-ish form could have 4.

amelius
2 replies
22h34m

Yes, rectangle would also be degenerate. Basically any configuration where adding an epsilon weight somewhere generates a non-epsilon shift so to speak.

s1artibartfast
0 replies
14h10m

A plus shape "+" has four stable equilibriums which all stable optimums, resistant to weight and self correcting.

marcosdumay
0 replies
22h20m

You mean unstable?

tedunangst
3 replies
1d17h

Not so easy to get just the tip of the iceberg to stand out.

o11c
0 replies
1d16h

Try drawing a "^" shape. The fundamental constraint is that the iceberg hates going too deep; with the two legs, any rotation would force that and is thus forbidden.

A flat bottom can almost work but is highly prone to accidental asymmetry.

navane
0 replies
1d11h

A very flat triangle with convex flanks does the job

ant6n
0 replies
1d9h

Draw a fat boat with a very thin long mast.

squarefoot
1 replies
1d1h

No idea if others at Twitter suggested this as I can't read the thread (and have no intention to subscribe) but a nice add on would be a score inversely proportional to the travel an iceberg would need to obtain a stable floating position, with ideally the very hard goal to draw it already in a perfect stable way, waterline height included.

Someone
0 replies
1d

It isn’t too hard to get fairly close to that by drawing something that’s extremely stable, for example something very wide but not tall or an equilateral triangle, with one corner facing down.

Then, use your first attempt to correct for the correct height.

⇒ I think a good game would need some other constraint, maybe score more for max height above the surface, or for how long a polar bear can keep their feet dry while it melts (a very wide but not tall stripe will melt faster than something resembling a ball)

sinuhe69
1 replies
1d3h

I got a design which wobbles infinitely! :D The clip was live recorded, not looped.

https://streamable.com/0a9zmb

Dunati
0 replies
1d1h

It seems to have trouble with long skinny shapes, I had one that would keep moving and occasionally flip over

kromokromo
1 replies
12h24m

To the author: Would be interesting to store all the shapes people are creating and let us quickly browse through them.

Mostly penises most likely (like any "draw something online" service).

(I am also guilty)

joshdata
0 replies
2h53m

Yeah, I don't want to be responsible for user-generated content, and I don't want to collect data on users.

GeorgeRichard
1 replies
1d10h

This is great fun--and accurate. My lettuce floated just like the picture I drew when I tested it in the bath.

xg15
0 replies
1d7h

I know you should wash lettuce before eating, but that seems like overkill...

(jk)

taneq
0 replies
1d2h

From my brief experimentation I have determined that the precise initial orientation of the dick^H^H^H^Hiceberg is critical to its final orientation.

talkingtab
0 replies
1d2h

My fun was to try to get the widest underwater part with the narrowest top showing above.

sa46
0 replies
22h49m

The HTML source code is a well-commented, fun read.

- There's a fair bit of math to model drag, mass, and density using the specific gravity of ice and seawater (with tweaks to make it more realistic for 2d).

- Try adding a polygon that overlaps itself (self-intersects).

- You can paste images! The code traces the image and picks the most complex polygon.

praptak
0 replies
1d7h

The center of displacement is always below the center of mass, so the iceberg never gets the stability of a rock hanging on a thread (ships can do that with ballast).

The only way for an iceberg to achieve stability is "differential" - every infinitesimal movement needs to move the center of displacement in a way which counters the movement. This basically means flat bottom.

nick7376182
0 replies
1d16h

Would be cool if it melts preferentially, choosing either air or water to be "warmer".

mrcwinn
0 replies
1d14h

I’m so over flappy birds now.

miduil
0 replies
1d6h

Kinda funny to draw the classic examples of "tip of the iceberg" to see them ending up flipping :D

mhatma
0 replies
1d12h

This is very entertaining.

madcaptenor
0 replies
1d2h

A version which has some preloaded shapes and shows the forces explicitly, inspired by the same tweet: https://engaging-data.com/iceberger-remixed/

This is all from 2021 and I feel like I’d seen this prior to that but I can’t find it.

ljsocal
0 replies
1d5h

It would be interesting to create a version of this that would show how different displacement hull shapes would float.

blackoil
0 replies
1d15h

For me multiple humps seems to be most stable

barfbagginus
0 replies
1d5h

Note that many icebergs have more than one equilibrium, with various final heights above the water.

For example this iceberg towers above the water in one equilibrium, but barely rises above the water in its other equilibrium.

https://ibb.co/SdcKMBV

arun-mani-j
0 replies
1d12h

Very cool (literally) stuff. I drew a straight line and it keeps spinning :D

amelius
0 replies
23h57m

Now let a polar bear walk on it.

alphanumeric0
0 replies
1d13h

This reminds me of gömböc

Obscurity4340
0 replies
1d7h

This would make a great "fidget" app

Gunax
0 replies
1d17h

Very cool, simple, and easy. This is exactly what demos should be.