Height-altering crystals can be found deep within the Gravity Falls Forest and, as their name implies, they can change an object's or living being's (animals and humans) size when light shines through them.
Use
The flashlight in action.
To make for a more efficient use, Dipper attached a crystal to the lens of a flashlight. By flipping the crystal to a specific side and pressing the button on the flashlight, a beam of light will fire - light blue for a size increase and pink for a size reduction - and will cause the subject to grow or shrink, with a more drastic change occurring the longer the button is held down. When the desired size is reached, the user should let go of the button.
History
Dipper reading the crystals entry page in book 3.
At some point before the events of the series, Ford came across and studied the crystals, recording their powers, appearance, and location in said book.
In "Little Dipper," after Mabel teases Dipper for being a millimeter shorter than her, Dipper looks for a way to increase his height. Upon reading about them in Journal 3, he searches for them in the forest, and after tumbling down a hill, he finds them. He removes a crystal and takes it home, where he assembles his crystal flashlight and uses it to change the size of a chess pawn and later himself. When Mabel discovers what her brother is doing, she tries to steal it from him and they fight over the flashlight. When Mabel accidentally reveals its function to Gideon Gleeful, he uses it to shrink the twins and accidentally Soos. Later, he attempts to shrink Grunkle Stan, but to no avail. Dipper and Mabel grow themselves back to their full heights and smash the crystal, but after realizing, they forgot to regrow Soos they glue it back together.
In "Gideon Rises," the height-altering crystals page from 3 makes an appearance while Dipper and Mabel are thinking of a way to defeat Gideon and it is later seen again in the end credits.
Sightings
Season 1
- 111. "Little Dipper"
- 120. "Gideon Rises" (pictured)
Season 2
- 220-221. "Weirdmageddon 3: Take Back The Falls"
Games
- The Twin Mystery Vortex of Doom (pictured)
- Attic Stuff Golf
- Rumble's Revenge
- PinesQuest
- Li'l Gideon Shrinks Back
Trivia
- The crystal that grows and shrinks things when a beam of light pass through it may be a reference to The Adventures of Teddy Ruxpin, where a similar crystal was a key tool for the heroes, and was often powered by a flashlight.
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