Comments on: DOEP (Daily Open-Ended Puzzle) (intermittent): The speed of a crawl

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By: dib

dib — Mon, 09 Apr 2007 13:03:55 +0000

It’s a matter of pixel size and relativity. A large screen showing the same content as a small screen will have pixels (the basic unit of color information) of much larger size. Those larger pixels will be advancing at the same rate as small pixels, but coverning a much larger distance with each movement. As CG noted, your distance to the screen determines your perception of the relative size of each pixel, and the relative speed at which each pixel travels.

By: Charlie Green

Charlie Green — Sun, 01 Apr 2007 15:59:04 +0000

It is all relevant to angular, rather than linear, velocity. One assumes the screen subtends the same visual angle regardless of size; if not, then it is like Bill said, dependent on viewing distance. Get right next to the 60″ screen and watch those pixels fly by!

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By: Bill K

Bill K — Sun, 01 Apr 2007 13:31:22 +0000

But to answer the question about mathematically representing the text crawl rate independent of the screen size, I think Frank is on the right path.

You can look at this as periodic motion, ie, if the text takes 4 seconds to move across the entire screen, that’s 4 sec/screen, or take the inverse, 1 screen/4 sec., or 0.25 Hz. The refresh rate on your PC monitor uses Hz.

Getting back to apparent speed viewed at a distance from my first comment, if you set up your 4-mile-wide TV so that the text refreshes at 0.25 Hz, than take a helicopter and climb to an altitude so that the screen occupies the same field of view as your 15″ screen in your bedroom, I bet the text will look like it’s moving about the same rate, or 4 mph, even though it’s actually moving at 3600 mph.

But I think your audience can relate better to a description of text moving at about the pace of a leisurely walk, ie, 4 mph, rather than saying it has a refresh rate of 0.25 Hz.

By: Bill K

Bill K — Sun, 01 Apr 2007 05:17:04 +0000

It depends on how close you’re sitting to the tv, rather than the size of the screen. While time intervals seem relatively constant, the perception of size and distance is more variable.

Think about this. When you’re on an airliner going to Blogapalooza 2007 on the left coast, you might be going 600 mph, but since you’re at 30,000 ft, the vast fruited plain of flyover country is just perceptibly moving underneath you. Imagine what the experience would be like if you flew at 500 ft instead? It would seem like you were in the middle of a Philip Glass/Koyaanisqatsi sequence.

You can see this effect with the zipper signs on the buildings in Times Square. If you’re standing on the sidewalk below looking up trying to read the words, it looks like they’re moving at a frenetic pace. But from one-half block away, they are easily readable.

I think this is why BASE jumping (freefalling from a building or fjord or El Capitan) is such a rush. Falling at 120 mph from a plane, there’s nothing around you to give you a sense of speed. But, if have a rock face or a building facade 30 feet away from you, if must give you a terrific sensation of speed.

By: fp

fp — Sun, 01 Apr 2007 03:11:57 +0000

Perhaps if you think of the movement as an illusion, recalling the story of the incandescent light bulb in your lamp flickering at 60 cycles per second and seeming to transmit a continuous stream of light…
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Perhaps