Harrison Farm

for now, the only thing we're growing on this farm is kids - not the goat variety

Author: Doodle

My shadow project

[A little introduction by Marathon: ]

We were talking about solar eclipse phenomena recently. I told the kids about my memories from eclipses that I experienced as a boy, especially about how all the leaves of a tree would take on the shape of the eclipse.

After the conversation, I did some image searches so I could show them what I remembered.

I was stunned to find that the truth was nothing like I remembered it!

Instead, there are thousands of images showing pinhole-camera effects. That is, the light from the sun passes through tight squeezes between the leaves and casts itself on the ground as an inversion of the sun's distorted shape. Here is a typical example (Photo by torbakhopper):

backwards in time -- leaves as a natural pinhole camera during solar eclipse : san francisco (2012)

I couldn't find a single picture to support what I remembered!

But I couldn't seem to let go of it either. Without being able to explain very well why, it just seemed to me that there would be an eclipse shadow effect separate from the well-known pinhole effect.

I muttered something to the effect of, "We'd need some fancy lighting or a computer program to know if there was any truth to what I was thinking."

Little did I know that wheels had been set in motion...

Over the past week, I have been working on a project. A coding project.

Sometimes we would play games with light during supper, when the light from the sun would reflect off glass buildings. I noticed that the shadows were almost perfectly crisp, even though our shadows fell on a wall that was 15-20 feet away.

That isn't the case when the light is coming straight from the sun.

In the morning's direct sunlight, the shadows are all fuzzy, and they would do all kinds of crazy stuff, like jumping over to other shadows, or some shadow that is a lot thinner than it should be...

A week ago, I had a realization about why shadows seem to warp sometimes.

I had always assumed that it was from the light of the sun bending, slightly.

But that isn't the case. I realized that if you have a small slit letting sunlight through, there will be a light spot on the ground that is a good bit wider than the small slit. I realized this was because of the light from the right side of the sun shining through to the left of the slit, and vice versa.

During an eclipse, also, a tree shows many mini eclipses on the ground, on it's shadow. This, we found out, is due to the pinhole effect.

Marathon still felt that a normal object, without a pinhole might also give an eclipse-like shadow. We made this big sketch, we kept messing up, but finally, we were pretty sure that any object would give a slightly eclipse-like shape.

It would take a long time to explain it all in writing. It's pretty complicated.

So, instead, I did this coding project to make it easier to understand:

https://www.khanacademy.org/computer-programming/eclipses-shadow/5898189205209088

I consider ~150 inches from the ground to be the best distance for seeing the eclipse-like shadow.

Hope you like it!

[Marathon: So, thanks to Doodle's javascript program, we can see how a shadow of basically anything leaf-sized, that is positioned around 12 feet above the ground, gets distorted by parallax effects to look vaguely like the crescent of the eclipse.

Here's a leaf-like shape's shadow at 10 inches above the ground during an ~80% solar eclipse:

Now here's the same shape's shadow at the same moment if it was 12 feet off the ground:

Totally different!

Even the staple shape, that already is a crescent of sorts, will bend to roughly become a crescent in the opposite direction! Try it for yourself.

Here's another neat effect we found. If you set the moon's size to be slightly smaller than the sun so that it allows for a "ring of fire" at the point of complete eclipse, here's what the shadow of a ping-pong sized ball looks like.

Another symmetrical shape that gets bent into a crescent:

 

 

 

The Bicibahn

Dad and I have been going out every morning to ride our bikes since Sunday.

We started going out more often because a really nice bike path, wide and smooth, was recently made.

There's this long section with no stops, slightly sloped because it goes along the river. We call it the Bicibahn, named after the Autobahn in Germany.

On the way back down the bike path, I normally draft off Dad. If I can keep up with him, he'll "torque out". He has a mirror on his helmet, so he can see how I'm doing.

Early in the week, it was a little scary, but now it's fun and exciting.

Most of the time, I have to mouth-breathe to keep up with him. Sometimes I'll even get little pebbles in my mouth, thrown up by his tire.

Anyway, this morning, I was struggling to keep up with him when I thought, "I wonder how fast we're going?" I was in my top gear, and pedaling at 100-120 RPM. I was close to out-spinning my top gear.

Photo by YoVivoMapocho.

 

Other Pieces of Music

Here's another piece of music that's a lot longer.  ~4min long.

This one, Growth, has three parts, whereas The Storyx only had two.

Hope you like it!

 

Here's Face-Scratch:

My Favorite Piece of Music so far

I think this is my favorite piece of music I've written so far. Before, I was writing by hand. It was very slow, and it was hard to do more than one or two notes at a time, because all I had for playing the music was Carman's recorder. I could play arpeggio chords (one note at a time), but it was hard to get something that really sounded good.

That was before I went over to the King padpad. Sorry for the name, but it is the real name. It was a typo. Then, we got the Ensemble Composer app. You can make music on it, as many parts as you like, then you can play it.

Here's my favorite one, The Storyx:

More Drawings

I have forgotten to post my pictures for more than six months! I have a lot more drawings to show off.

 

Can you guess who this is? It came from a newspaper.

DSC00629

 

Here is my name written in Chinese, in 3-D with perspective.

DSC00632

 

This is a drawing of a 3-D sculpture.

DSC00635

 

This is another 3-D drawing with perspective.

DSC00648

 

That's all for now!

Drawings

For the past month, I have been really getting good at drawing.

One day I drew Rosebud reading, and it didn't look too bad.

Then I got into drawing faces.

Here's one of Milkmaid:

DSC00408-001

Here's one out of my imagination. I tried to make it look like someone in a mood.

DSC00409-001

I also like drawing hands.

Here's one of my fist.

DSC00407-001

Here's one of my shoe that I drew about a month ago.

DSC00406-001

I hope to have more drawings to show off, but they have to be good enough.

Moody Noriega

I have a little ball that I've named Moody Noriega.  Let me tell you how it got it's name.

But first, do you know what a palindrome is? It is a word or a sentence or a paragraph or any type of text that is read the same both backward and forward when not including any punctuation or capitals or spaces, for example, "race-car" or "Stanley Yelnats" or "Aha!".

I created a program on Khan Academy which challenged the user to think of a palindrome longer than mine, that I had come up with myself: "No stop! A pot's on!"

One of the users put down in the comments a palindrome longer than mine: "'Are we not pure?' 'No sir!' Panama's moody Noriega brags, 'It is garbage! Irony dooms a man, a prisoner up to new era.'"

Then Carman and I came up with a game. We collect the left-over pipes from our stretch wrap and aluminum foil, and we set them up on their ends, and we take turns throwing at them, and whoever had knocked the most pipes over wins that round.

But we normally set at least two pipes on top of the "Panama Jack" box, that we ended up calling the "Panama Noriega" box.

And we ended up calling both the game and the ball that we throw to knock down the pipes, "Moody Noriega".

Moody Noriega

I’m Dehind You!

We have a new writer folks!  Meet Doodle.  Take it away, Doodle.

I have these weird socks that have words on them. I mean, doesn't that sound a little funny?

Firstly, go through a store and try to find some socks that fit nine year old Doodle that have words on them.

Secondly, these socks say, "I'm behind you". How much sense does that make?

Thirdly, these socks actually don't say, "I'm behind you". They say, "I'm dehind you".

Milkmaid told me this poem that goes like this, "'I' before 'E' except after 'C' or when sounds like 'A' as in neighbor and weigh". I had a hard time spelling "weird" because of the poem, but now I'v corrected it. "I" before "E" except after "C" or when sounds like "A" as in neighbor and weigh - also in the word weird (the fourth letter of this post) because it's weird.

© 2017 Harrison Farm

Theme by Anders NorenUp ↑