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Two photos, one question

Little Springtime works at the media lab at her university. They have a 3D printer, which, from next semester (... I think?) will be available to students to use. She tested it out and made a hedgehog.

DSCN5496

Yesterday and today have been cold, with magnificent if somewhat ominous high winds, but the day before yesterday was warm and melty. Melted snow was coursing down the road. Or rather, it was lapping down the road.

Why does it go down the road in ripples like this? (See the smiles, one after the other? Those are the ripples I'm talking about.) Why not one smooth sheet of water?

DSCN5494


Comments

( 25 comments — Leave a comment )
sovay
Mar. 18th, 2015 12:24 pm (UTC)
She tested it out and made a hedgehog.

I think that is an excellent test run.
asakiyume
Mar. 18th, 2015 03:05 pm (UTC)
Me too! I never thought I'd have something made by a 3D printer in my house, much less that that thing would be a cute hedgehog.
dudeshoes
Mar. 18th, 2015 01:14 pm (UTC)
I'm crazy about the hedgehog!
asakiyume
Mar. 18th, 2015 03:05 pm (UTC)
He is very cute :-)
docdad2
Mar. 18th, 2015 03:00 pm (UTC)
The water flowing speed is limited by the lower interface and upper free flowing. It builds up a 'Wave" much like you wee at beaches.
Nice use of a 3D printer.
asakiyume
Mar. 18th, 2015 03:04 pm (UTC)
so the friction on the interface causes the water to build up? And that's what makes the wave form?

docdad2
Mar. 18th, 2015 03:08 pm (UTC)
the water exposed to air flows faster than the water against the pavement based on the depth of the water sheet. The wave builds up as a result of the friction between the two flow rates. The wave's weight then speeds up its movement and the speed is maintained by the height of the "Wave".
asakiyume
Mar. 18th, 2015 03:10 pm (UTC)
**thank you**
(Deleted comment)
genarti
Mar. 20th, 2015 06:07 pm (UTC)
This is so cool. It never occurred to me that wave physics would apply so visibly to such shallow streams of water. Thank you!
noachoc
Mar. 18th, 2015 03:40 pm (UTC)
What does the hedgehog feel like? Is it rubbery, stiff, papery? Is it solid or hollow?

3D printers blow my mind.
asakiyume
Mar. 18th, 2015 03:51 pm (UTC)
It's solid and very hard and stiff, but very light. Wild.
oiktirmos
Mar. 18th, 2015 04:01 pm (UTC)
Amazing hedgehog!
George Hart (Vi's father) used a 3D printer to make rollers to make Escher cookies. The software is here.
http://www.georgehart.com/rollers/


Edited at 2015-03-18 04:02 pm (UTC)
yamamanama
Mar. 18th, 2015 07:19 pm (UTC)
Vi Hart sounds like the kind of person who would find a way to create a 4D printer so she can have Klein bottles.
asakiyume
Mar. 20th, 2015 03:37 pm (UTC)
I want to make Escher cookies now!
khiemtran
Mar. 18th, 2015 07:58 pm (UTC)
That hedgehog is very cool!
asakiyume
Mar. 20th, 2015 03:32 pm (UTC)
He's quite nice to hold in the hand, too :-)
scallywag195
Mar. 19th, 2015 03:14 am (UTC)
I was just reading a couple days ago about 3-D printers that are making organs. But....I can't remember much beyond that. I must be getting older.

If we had flowers I'd take pictures and make you ooooo and ahhhhh. What else can I say about the fact that you've gotten our winter? We had pussywillows two weeks ago and a large flock of robins three weeks ago. No snow and only skijored twice all winter.

Hmmmm. Maybe I REALLY should go out and see if the violets have come up yet (even though it's 6 weeks early).
asakiyume
Mar. 20th, 2015 03:34 pm (UTC)
My son was talking about the printer that could print organs! We really are living in the Star Trek future.

The pussywillows are gamely trying to bloom here too. They must be grumbling about the way the season has failed to live up to its side of the bargain--still so cold and snowy!
scallywag195
Mar. 19th, 2015 03:17 am (UTC)
Have you ever noticed that I'm almost always the last person to comment on your posts?

It's so rare that I actually do anything but emails and maybe write on my computer in the morning and I believe you are several hours ahead of me.

asakiyume
Mar. 20th, 2015 03:36 pm (UTC)
Comments come in waves--a lot depends on posting time, too: is it when the Europeans are up? The American East Coast? The West Coast? India? It really makes me feel the sphericalness of our planet :-)
danceswithwaves
Mar. 19th, 2015 05:41 am (UTC)
Such a cute little printed hedgehog! Today I learned that the UK is concerned about declining hedgehog populations and is creating conservation spaces for them. Also, there's an entire British Hedgehog Preservation Society!
asakiyume
Mar. 20th, 2015 03:39 pm (UTC)
I'm glad they're under protection! They're sweet creatures.
heliopausa
Mar. 19th, 2015 10:06 am (UTC)
The Escher cylinder seals are great! Rolled over clay they'd make great plaques, or maybe shallow rectangular dishes to hold fruit.

Edited at 2015-03-19 10:09 am (UTC)
asakiyume
Mar. 20th, 2015 03:39 pm (UTC)
Yes they would! .... and I'd like to try them for their cookie purpose, too.
( 25 comments — Leave a comment )

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