Brandon Seah kbseah

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I have a public key ASB-MYQvJhi_d7XjzpMaA34DUOYW-I0xJ7cQg7Yi82K4mQo

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GNU Screen Cheat Sheet

Basics

ctrl a c -> create new window
ctrl a A -> set window name
ctrl a w -> show all window
ctrl a 1|2|3|… -> switch to window n
ctrl a " -> choose window from menu
ctrl a ' -> choose window by number
ctrl a ctrl a -> switch between window

Pulfrich effect - Animated explanation

The Pulfrich effect is an optical illusion where objects moving in a single plane also appear to have depth, because the processing of the visual signal in one eye is delayed, e.g. by holding a filter in front of one eye to dim the light reaching that eye but not the other.

See my other Gist for more info.

What this animation shows

This animation illustrates how the time delay in one eye leads to the stereoscopic effect. This diagram shows the view from above looking vertically down at a viewer facing a pendulum (or a display screen) oscillating within the (flat) plane of motion.

Pulfrich effect - Moving scenery demo

The Pulfrich effect is an optical illusion where objects moving in a single plane also appear to have depth, because the processing of the visual signal in one eye is delayed, e.g. by holding a filter in front of one eye to dim the light reaching that eye but not the other.

To view the animation you'll need to make such a filter. One simple method is to take a cheap pair of sunglasses and pop the lens out of one side.

What also works, but not so well, is to fan out the fingers of one hand in front of one eye and rapidly wave the hand up and down to occlude the image with a "strobe" effect.

What to expect

Pulfrich effect - Pendulum demo

The Pulfrich effect is an optical illusion where objects moving in a single plane also appear to have depth, because the processing of the visual signal in one eye is delayed, e.g. by holding a filter in front of one eye to dim the light reaching that eye but not the other.

To view the animation you'll need to make such a filter. One simple method is to take a cheap pair of sunglasses and pop the lens out of one side.

What also works, but not so well, is to fan out the fingers of one hand in front of one eye and rapidly wave the hand up and down to occlude the image with a "strobe" effect.

	#!/usr/bin/env python3

	dict = "/usr/share/dict/web2" # default path in Mac OS X
	key = "H" # the letter that must be in the word
	allowed = "CEKLMO" # other allowed letters
	min = 4

	with open(dict, "r") as fh:
	for word in fh:
	word = word.rstrip().upper()