From my post on Geek Dad:

Doing magic with your kids is one of the more excellent things you can do as a father. For one thing, kids are a truly appreciative audience, and if you’re an amateur like me, probably the only truly appreciative audience you will ever actually get! Also, kids can be a tough audience, because they haven’t developed the preconceptions that make certain forms of misdirection more effective on adults. Finally, teaching your kids a card trick is a special bonding experience because it involves the sharing and keeping of powerful secrets.

Every few years I renew my casual acquaintance with conjuring. I now have a  small library of books about magic, and a case under my desk which is filled with all manner of scarves, cards, coins and secret apparatus. Because I’m a computer geek,  many of the magic tricks in my repertoire involve the computer in some way. For example,  I’ve made a number of Flash based card tricks, such as Mind Power, shown here.

My most astounding tricks, however, require that a magician be present next to the computer. One such trick is my "Bondoogle" effect, which you can read about on my website.

Most of the card tricks performed by professional magicians involve expert card manipulation, something which I’ve never really mastered, hence my repertoire of computer-assisted slights. However, there is a whole class of tricks which are  called "self working" which can be easily taught to kids and are much easier to perform.

You’ll find a large number of high-quality self-working tricks in the inexpensive Dover series by  Karl Fulves, which includes Self Working Card Tricks and More Self Working  Card Tricks.

I imagine every reader of this blog knows at least one card trick which is worth passing on to a child.  Here’s the very first card trick I ever learned, an excellent first trick for a very young child.

THE EFFECT

The magician fans out the cards, face down on the table.  He says to the spectator, "Point to a card that you think is a five".

The spectator points at a card.  The magician picks up the card, looks at it and says "Very good, now point at a card that you think might be a seven".

The spectator points at a card.  The magician picks up the card, looks at it and says "Excellent, now point at a card that you think might be a queen".

The spectator points at a card.  The magician picks up the card, looks at it and says "Great, now I’m going to pick up a card that I think is a four."

The magician picks up a card, and lays all four cards face up on the table.

The cards are a five, a seven, a queen and a four!

THE METHOD

This trick uses a well known method called "one ahead".

The magician knows the position of the five.  In the simplest version of this trick, you just look at the bottom card and use that card.

You ask the spectator to point to the "five" or whatever card you happen to know.  If the spectator chooses the bottom card, you’re done. Otherwise, you look  at the number on the card the spectator pointed at, and ask him to point at that number.  You repeat this, and then finally you take the original five, pretending it’s the last card the spectator pointed at.

When you grab the final card, position it first in the pile in your hand, so that when you lay down the cards, the numbers appear in the correct order.

I’ll be giving a free lecture on the “Creative Use of Flash” at Yahoo! in Santa Monica, on Wednesday, May 23rd. You can get the full event details here.

This is the first installment of a “Creative Talks” lecture series that is being put together by Yahoo! creatives Jeff Hurlow and Jens Jonason.

I haven’t yet worked out exactly what I’ll be showing, but you’ll be sure to see (and hear) the Whitney Music Box, Coverpop, and various Flickr Hacks. There’s also a good chance I’ll do a card trick.

Bring your own banana hats.

For professionals with some Flash experience, my night class “Interactive Toys: Advanced Toys” (7 weeks, starting Thursday May 17th) offers a chance to learn Actionscript, and make a variety of software toys, interactive widgets and games. Visit the Art Center at Night website for more details (the course is also offered to full time Art Center students).

For high school kids, my weekend class, “Videogame Design” (10 weeks, starting Saturday June 9th) is an introduction to making classic arcade-style games using Flash and Actionscript. Although I can’t teach you to make “Grand Theft Auto” in 10 weeks, I can definitely help you make games like “Space Invaders”, “Frogger” and “Pong”. It’s a great introduction to programming and a lot of fun. See the Art Center Saturday High website for more details.

I had great fun presenting at the Gel (Good Experience Live) 2007 conference in NYC.

My interactive Whitney Music Box (in which the crowd made noises while host Mark Hurst controlled them with a knob) worked quite well. The audience of about 400 was game, and enthusiastically yelled “PI!” (or maybe “PIE!”) when their assigned numbers crossed the line, producing a pleasant cacophony.

The rest of the conference was awesome. My favorite presenter, I think, was Andrew, of “Songs to Wear Pants To”, a young songwriter who demonstrates that arbitrarily imposed constraints can be wonderfully productive for the creative process. Andrew composes short songs, on request, when his fans send him emails explaining what they want. His process reminds me a bit of the Dial a Song service, run for years by They Might Be Giants, and it seems to have similar benefits – Andrew has produced a cornucopia of sonic riches.

Urban Prankster Charlie Todd was also a favorite of mine. I spent much of the day yesterday playing all the prank videos on the Improv Everywhere website. I only wish I lived in New York so I could participate!

Douglas Quin’s recordings of Antarctic seals are highly evocative of synthetic sounds, and sounded like quotes from the Whitney Music Box.

I was especially jazzed to be able to brainstorm about nerdly things with fellow geek Robin Burgener, creator of the 20Q handheld game (and more importantly, the neural network that powers it).

Indeed, all the presenters had something really special to provide. There wasn’t a dud in the bunch.

A Flash-8 kaleidoscope I’ve been making today. Click to play with it (requires the Flash 8 plug-in).

The raster graphics added in Flash 8 enable larger and better performance kaleidoscopic effects than in prior versions. I’m finally able to achieve effects that formerly required graphics acceleration, such as C++/OpenGL.

I facetiously numbered this 842. Actually I’ve lost count of how many kaleidoscopes I’ve made over the years. Today I made four, but this one came out the best.

I’ll be one of the presenters at next week’s GEL conference in NYC.

This is my first GEL conference and it sounds quite interesting. Each of the presenters only gets 20 minutes to speak, so we’re forced to ‘come to the nut’ pretty quickly. I’m planning on exacerbating the information-overload of the poor, addled attendees by showing about 3 years worth of material in the first 10 minutes of my slot, but I’m mainly there to present my Whitney Music Box in giant screen glory.

I’ll be demonstrating a unique interactive version of the music box in which the 400 attendees will vocally produce the sounds as I hand-crank the dots, ala variation #17. Essentially the crowd will be doing ‘the wave’ with some extra mathematics. It should be either hugely entertaining, or slightly disappointing, but on a really big scale. We’ll see.

I hope to see some of you in New York!

An interactive mosaic of candy photos by Cybele-LA, from the Candy Blog.

GamePuzzles.com is the website of Kadon Enterprises, a family owned business that builds beautiful puzzle toys to order out of acrylics and wood in their workshop in Pasadena, MD.  Most of their games consist of sets of tiles that fit together in interesting ways, such as Polyonimoes, Penrose tiles, and edge matching games using regular tilings, such as Kaliko and Dezign-8 (both shown below).

They also have a good collection of puzzle games for kids, including Rombix Jr, RoundDominoes, Ten-Yen, Hexnut Jr, and Bear Hugs.

Many of the puzzle games in their online catalog have interactive Flash versions, so you and your kids can try them out.

Yeah, I know what you’re thinking.  You want one of the 25-watt CO2 Synrad lasers and computer-controlled motion tables they use to make these babies. 

Yeah, me too…  Sigh…

(I originally posted this on GeekDad).

Here’s my latest Quartz Composer screensaver for the Mac. This combines the fibonacci spiral seen in a lot of my graphic images with the harmonic motions from my Whitney Music Box.

The motion in this screensaver is actually quite simple — if you look at each disc, you’ll see that it is just sitting in place, rotating at a constant rate. However, each disc spins slightly faster than the next largest one, which produces a series of very interesting patterns over about a 10 minute cycle.

Mac Users: To install these as screensavers, drag them into your Library/Screen Savers folder. If you don’t see a ‘Screen Savers’ folder in your library folder, make one. Any .qtz files in this folder will appear in your list of screen savers on the control panel.

By the way, if you don’t have a Mac, or just want to see the effect without downloading the screensaver, click here to view a flash movie which uses the same effect (although not as elegantly as the screensaver).

I would love to figure out how to produce a mechanical version of this screensaver, using real discs or spheres, driven by a single chain and controlled by a crank, but I haven’t yet figured out a simple way to construct it.

One of the reasons I produce so many screensavers is that I really don’t like having screensavers I didn’t personally write running on my computer. Since I get bored easily, I make new ones from time to time.

I think the Yahoo logo works well in this screensaver (and I work there, so it’s appropriate), but feel free to edit this in Quartz Composer and swap in your own logo.

I wrote today about the origins of Lego Mindstorms today on the WIRED blog that I contribute to, Geekdad. You may not know that Lego Mindstorms gets its name from a book by Seymour Papert called Mindstorms: Children, Computers, and Powerful Ideas.  I first read this book in the 1980s, and I took Papert’s educational philosophy to heart when I started teaching Lego Mindstorms classes to younger kids (that’s one of my students in the photo).  Papert’s ideas continue to guide me in my Flash videogame programming classes for high school kids.


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