Answer:
The machine is a kind of square and technological room where the humans of the future live.
Step-by-step explanation:
The days that pass at the machine are repetitive. People interact with each other through technology and without having physical contact with each other.
A description of how the days are here can be seen in these lines:
"She made the room dark and slept; she awoke and made the room light; she ate and exchanged ideas with her friends, and listened to music and attended lectures; she make the room dark and slept. Above her, beneath her, and around her, the Machine hummed eternally; she did not notice the noise, for she had been born with it in her ears. The earth, carrying her, hummed as it sped through silence, turning her now to the invisible sun, now to the invisible stars. She awoke and made the room light. "
Vashti does the same thing every day. Wake up, turn on the lights, press some of the various buttons on the machine, talk to people virtually and go back to sleep.
The people of this future do not seem to have direct contact with the outside world.