The device lies before you: simple, unassuming, nothing more than a white touchscreen attached to a 20-centimeter box. There are no gaps by which to see inside, no seams or bolts or rivets; the inner workings are a complete mystery. And yet, the attached leaflet contains rules and instructions that indicate the device's wonderous ability.

"Place your hand upon the screen," it reads, "And proclaim the form you intend to take, and for how long you will remain in such a form. In an instant, your matter and senses will become your chosen form, no matter where on Earth it is!"

Below that, in bold red font:
"WARNING:
Device requires at least 8 hours to recharge. Transformation durations must be of at least this length.
Transformations must be of a volume less than 2 cubic meters (around the volume of a household couch).
Transformations must be of nonliving material.
At the end of a set duration, subject will revert to their prior form in the closest available location to the object of transformation.
Use Caution: It is possible to lock yourself in a form indefinitely. Only Certified Technicians with access to the device may rectify this."

And that is all there is. You wonder for a moment if this is some kind of prank, or social experiment. But, temptation finally overcomes you. The glow of the screen shines around your fingers as you place your hand upon it. Surely this couldn't work... but what if it does?

Determined to find out, you think of something you could stand being for 8 hours, and then speak the words: