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"...glaring at a series of diagrams showing an owl turning into a pair of opera glasses."
Hermione Granger studying this spell from Intermediate Transfiguration[src]

Owl to Opera Glasses[1] (Strigiforma)[1] was a transforming spell that could be used to transform an owl into a pair of opera glasses.[1][2]


It was covered in Intermediate Transfiguration, a book studying transfiguration; a series of diagrams helped readers understand the spell.[2]

During the 1986–1987 school year at Hogwarts School of Witchcraft and Wizardry, Professor Minerva McGonagall taught her third-years how to perform this particular transforming spell in Transfiguration class.[1]

Hermione Granger read about this transforming spell while studying for her Ordinary Wizarding Level examinations in May of 1996 while discussing Professor Hagrid's request that they train his giant brother Grawp how to talk.[2]

Known practitioners


From strigis, the genitive form of strix, the Latin word referring to the Screech owl;[3] from forma, Latin for form or appearance. Also, in biology,[4] Strigiformes is the name of the taxonomic order that includes all owl species.[5]

Behind the scenes

  • The incantation is a misnomer, as it is indicative of an owl, but the spell transforms things into opera glasses, and not into owls. For example, Lapifors turns the target into a rabbit and Avifors the target into a bird. This might be a mistake from Harry Potter: Hogwarts Mystery developers, where the spell appears.


Notes and references

  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 Harry Potter: Hogwarts Mystery, Year 3, Chapter 7 (Jacob's Room) - Transfiguration Lesson "Owl to Opera Glasses" (see this image)
  2. 2.0 2.1 2.2 2.3 2.4 Harry Potter and the Order of the Phoenix, Chapter 30 (Grawp)
  3. Wiktionary favicon.PNG strix on Wiktionary
  4. Wiktionary favicon.PNG forma on Wiktionary
  5. WP favicon.PNG Owl on Wikipedia
Transfiguration (class)
COS Vera Verto demo.gif
Branches of Transfiguration Transformation · Vanishment · Conjuration · Untransfiguration
Notable practitioners Circe · Emeric Switch · Falco Aesalon · Mirabella Plunkett · Thaddeus Thurkell
Professors Albus Dumbledore · Minerva McGonagall
Textbooks A Beginner's Guide to Transfiguration · Intermediate Transfiguration · A Guide to Advanced Transfiguration
Transfiguration spells studied at Hogwarts
Colour Change Charm (Colovaria) · Change of hair colour and style (Crinus Muto) · Hardening Charm (Duro) · Mending Charm (Reparo) · Partial Vanishment · Reparifarge · Softening Charm (Spongify) · Switching Spell · Vanishing Spell (Evanesco)
Conjuring Spells Bird-Conjuring Charm (Avis) · Inanimatus Conjurus Spell · Bouquet Spell (Orchideous) · Snake Summons Spell (Serpensortia)
Transforming Spells Animal to Water Goblet (Vera Verto) · Armadillo to Pillow · Bowling Ball to Balloon · Beetle to Button · Cauldron to Badger · Cat to Cauldron (Felifors) · Cauldron Cakes to Cabbages · Chair to Cat · Cross-Species Switches · Desk Into Pig · Fairy Cakes to Fairies · Feather Duster to Ferret · Ferret to Feather Duster · Goldfinch to Golden Snitch · Flobberworm to Fritter · Gnomes to Lawn Gnomes · Guinea Fowl to Guinea Pig · Gobstone to Skunk · Hedgehog to Pin Cushion · Lovebird to Love Note · Match to Needle · Meddling Man to Monkey · Mice to Snuffboxes · Owl to Opera Glasses (Strigiforma) · Pawn to Queen · Porcupine to Pin Cushion (Hystrifors) · Puffskein to Paperweight · Small Child to Rat · Small Object to Dragon (Draconifors) · Snail to Teapot · Target to Bird (Avifors) · Target to Matchbox (Flintifors) · Target to Rabbit (Lapifors) · Teacup into Gerbil · Teacup to Rat · Teapot to Tortoise · Thimble to Thestral · Toad to Toadstool · Tortoise to Trumpet · White Rabbits to Slippers