Vi Hart Weekly, Sept 27, 2016

Welcome back to Vi Hart Weekly! As you know, every week has a theme, and sometimes when the theme is less obvious people enjoy drawing their own connections and trying to guess it. Spoiler: last week’s theme (or at least the one I intended) was tiny things / scale.

Now on to this week!

1. Improvisation of the Week:

Some piano + voice improvising I did after work on some day I forget. I forget what it sounds like, because getting it out of my brain is what recording and sharing things is all about. Bye piano thing!

I like Audacity for sound recording because it is so very simple. It doesn’t do hidden secret things or try to be smarter than the user. But when recording this I had a problem where occasionally Audacity would insert a bunch of zero values into the samples. All the information is there on either side, just these extra bits create an awful click sound.

I was hoping to be able to quickly search the samples for strings of zeros and remove them, but unfortunately they’re not quite zero, making it a little harder. Just getting rid of strings within a certain range could false positive on soft sections too. Really the thing to do is look for sudden changes in slope that go to/from zero. I managed to get rid of most of the clicks!

2. Vacation of the Week:


I’m feeling good and am later than usual for this weekly because I managed to take three days of vacation!

Says my brain. Really two of those days were the weekend, brain, and those don’t count. Ok, so one day of vacation, says my brain. Except I worked until 2pm before leaving for said vacation, so.

But pretty good, doin’ pretty good on the actually-take-time-off-and-don’t-burn-out thing. I only filmed one video while on vacation and I didn’t even edit it on vacation. Taking time off is important for being able to continue doing work, but it’s easy to look at that time and regret that I got so much less done in the past week than in weeks when I work constantly! A reason not to judge productivity on a weekly basis. Need larger sample sizes to smooth over the zeros.

3. What’s up at eleVR:

screen-shot-2016-09-27-at-4-26-21-pmWe’ve been spending some time lately organizing our many projects and blog posts, and I’m constantly amazed at how much we’ve done. So many experiments forgotten and dug up as we go through old bits of research. Our projects page is awesome.

One of these old experiments we never documented was when we tried making 360 video with just a normal smartphone and a cheap clip-on wide-angle lens, to see how inexpensive simple consumer VR creation could be. So I wrote up a post about that, and cut our old documentation footage into a video (in the post too).

But the big news is that Evelyn Eastmond is officially joining my team! I’m really excited about this because she is exactly the kind of deep-thinking world-aware artist-programmer I love working with, and I’ve been wanting to work with her for a while. So I’m just thrilled that she’s agreed to join. And now she’s in the regular eleVR blog rotation too, so you can check out her posts.

4. Vi Hart Video of the Week:

I posted about this in my previous blog post because videos sometimes get their own posts, but it’s still the Vi Hart video of the week.

5. Paper of the Week: Inventing Graphing: Meta-Representational Expertise in Children, by diSessa, Hammer, Sherin, and Kolpakowski


Recommended to me by Paula Te in relation to my work on Real Virtual Physics, this is a fun paper that describes a 5-day activity with a group of sixth-grade children where they are encouraged to invent and improve on different ways of representing motion.

It’s interesting to read through the thought processes of the kids as they critique various invented representations, and move towards things resembling traditional representations of motion (distance over time, speed over time, etc). It was also interesting that a big sticking point was how to represent the duration of a stop. Ah zeros, always messing things up.

I think there’s something very important about understanding what kind of thing a representation-of-motion is, and what information it should contain, that can only be gained by working with more than one kind of representation-of-motion (even if some of them aren’t very good). Once one knows what kind of thing it is, then looking at traditional representations makes more sense.

It’s also interesting to read transcripts of bits of students’ discussion, and how critique of peers—who are indeed the world experts in their own invented representation—can motivate deeper thinking than discussion of an existing standard representation (which even the teacher might not know the reason for various choices).