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Height-altering crystals are mystical crystals that appear in Gravity Falls. They can be found deep within the Gravity Falls Forest and, as their name implies, they can change the size of an object or living being (animals and humans) when light shines through them. However, the size change depends on the side the crystal is on, and therefore the type of light that shines through: blue light from one side with cause a size increase while pink light from the other side will cause shrinking. Dipper Pines uses one to create his crystal flashlight.

Role in the series

In "Little Dipper", Dipper is insecure about his height after Mabel Pines teases Dipper for being a millimeter shorter than her. Once he reads about them in 3, he searches for them in the forest, and after tumbling down a hill, 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's doing, she tries to steal it from him and fights for the light. When Mabel accidentally reveals its function to 'Lil Gideon, he uses it to shrink the twins and later accidentally Soos, and later attempts to shrink Grunkle Stan, but to no avail. Dipper and Mabel grow themselves back to their full heights and smash the crystal, but realizing they forgot to re-grow Soos, need to glue it back together. The crystal is presumably remade or replaced, as the flashlight is used by Dipper during Weirdmageddon.

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Gravity Falls Logo
Media
Gravity FallsDisney Super SpeedwayMystery Shack AttackRumble's RevengeDisney Infinity: 2.0 EditionLegend of the Gnome GemuletsLost Legends
Characters
Dipper PinesMabel PinesGrunkle StanFord PinesSoos RamirezWendy CorduroyWaddlesBill CipherSheriff BlubsDeputy DurlandManly DanOld Man McGucketTate McGucketGideon GleefulRobbie ValentinoPreston NorthwestPriscilla NorthwestPacifica NorthwestErgman BratsmanBlendin BlandinBud GleefulLazy SusanMr. PoolcheckPaper Jam DipperRumble McSkirmishSummerween TricksterToby DeterminedShandra JimenezTyroneTyler CutebikerDipper ClonesTambryCandy ChiuGrendaMelodyMayor BefufftlefumpterThompsonNateLeeGabe BensenGnomesGompersLilliputtiansSergeiPa and Ma DuskertonManotaursGobblewonkerXyler and CrazWax figuresMulti-BearQuentin TrembleyCheekumsMermandoAoshimaPterodactylAbuelitaMrs. GleefulThe UndeadShape ShifterAgent PowersAgent Trigger.GIFfanySprottLolph and DundgrenTime BabyLove GodMarius von FundshauserGhost of Northwest ManorBlind IvanJustin KerprankProbabilitor the AnnoyingCelestabellebethabelleDarlene
Episodes
Season One: Tourist TrappedThe Legend of the GobblewonkerHeadhuntersThe Hand That Rocks the MabelThe InconveniencingDipper vs. ManlinessDouble DipperIrrational TreasureThe Time Traveler's PigFight FightersLittle DipperSummerweenBoss MabelBottomless Pit!The Deep EndCarpet DiemBoyz CrazyLand Before SwineDreamscaperersGideon Rises

Season Two: Scary-okeInto the BunkerThe Golf WarSock OperaSoos and the Real GirlLittle Gift Shop of HorrorsSociety of the Blind EyeBlendin's GameThe Love GodNorthwest Mansion MysteryNot What He SeemsA Tale of Two StansDungeons, Dungeons, & More DungeonsThe Stanchurian CandidateThe Last MabelcornRoadside AttractionDipper and Mabel vs. the FutureWeirdmageddon

Locations
The Mystery ShackTent of TelepathyUnderground laboratoryGravity Falls, OregonGravity Falls ForestNorthwest ManorLake Gravity FallsGravity Falls PoolGravity Falls CemeteryDusk 2 DawnSummerween SuperstoreScuttlebutt IslandMystery MountainFearamid
Objects
Journal 1Journal 2Journal 3Smile DipPitt ColaHeight-altering crystalsCrystal FlashlightCloning Copy MachineCackling SkullsJack O' MelonsSoos' pick-up truckWax StanStanmobileElectron CarpetTape Measure Time MachineMemory GunMystic AmuletUniverse PortalGrappling hookThe Author's LaptopNathaniel Northwest's StatueInfinity-sided DieTime CuffsShacktron
Songs
Gravity Falls Title ThemeDisco GirlLi'l Ol' MeThe Lamby Lamby DanceHomework's WackMabel's the Boss NowStan Wrong SongDon't Start Un-BelievingTraining MixMabel GirlTaking Over MidnightWe'll Meet Again