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The Room Is the Puzzle: How Portal Teaches You to See Space Again

Portal (2007) gives you a single ability: open two linked doorways on flat surfaces. Its small team used weekly playtests to turn that ability into a staircase of lessons, and, lacking the resources for human characters, handed the story to a disembodied voice. This piece draws on Valve's official screenshots and two developer post-mortems from 2008. No ending spoilers.

"You Did!": The 1994 Banner That Had to Explain Clicking

In October 1994, a black strip at the top of HotWired asked readers whether they had ever clicked their mouse "right HERE." It was built in about a week for screens that might not show color, and it led not to a product but to a map of online museums. The people who made it remember why it looked the way it did, though not always the same numbers.

The Fireflies Are Waiting for an Answer

Synchronous flashing looks like a light show. It is closer to a conversation: males signal from the air, females answer from the ground. Once you see it that way, the lights and footsteps of the people watching start to matter.

From an echo to a seafloor map

Multibeam sonar measures depth and returning sound strength. Survey routes, corrections and targeted photographs turn those measurements into a map worth investigating.

How to read a record from an unfamiliar world

The Golden Record’s cover connects a needle, a recorded signal and a set of pictures—and gives a recipient ways to work out where the message began and how much time has passed.

How a moving planet gives a spacecraft a boost

Voyager left Jupiter with the same Jupiter-relative speed it had on arrival. Yet measured relative to the Sun, it gained speed. The difference lies in direction—and in Jupiter’s own motion.

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