Although World Book Day is meant for book-lovers everywhere to celebrate the literary arts, one tradition remains at the forefront of the holiday: the costumes children don with their classmates at school.
The ingenuity of parents-turned-costumers grows more impressive each time the holiday rolls around, and this year was no exception.
One tiny feminist dressed as a suffragette, for a combined World Book Day and International Women's Day costume.
Another bookworm earned thousands of retweets as Professor Slughorn from the Harry Potter series, after he transformed into an armchair.
Another crowd-pleaser came from the little fitness fan who dressed as Joe Wicks, body coach and author of bestselling 'Lean in 15'.
Others stuck to classic charactes from well-known storybooks, such as Alice in Wonderland and The Cat in the Hat.
From iconic storybook characters to, well, Joe Wicks, we've collected some of our favourite costumes from pint-sized book lovers.
Here are some of the best from today:
World Book Day @thebodycoach 😂 pic.twitter.com/nmqdy0s0zr
— GillDinCBT (@cbt_din) March 2, 2017
In honour of World Book Day, behold the best book-related costume: a child dressed as Professor Slughorn transfigured into an armchair. pic.twitter.com/baSTBNoxWy
— Alice Slater (@smokintofu) March 2, 2017
We went for a combined #WorldBookDay #WomensHistoryMonth costume pic.twitter.com/ENfKVHGEou
— Rachel Habergham (@RJHabbs) March 2, 2017
Congratulations Luka for winning our class costume contest on #WorldBookDay. We ❤️ Paddington! #woodpeckerchat pic.twitter.com/cqCGahAzHG
— Miss Young (@MissYoungCHAT) March 2, 2017
We just love nannies homemade costume for World Book Day#Reception👍📚 https://t.co/8o1IAY0tBr pic.twitter.com/5wsxsEPAAJ
— St. Bernadette's (@StBernsPrimary) March 2, 2017
#WorldBookDay costume no.1, Wimpy Kid. pic.twitter.com/8xSs8PFb2Q
— Jo (@housewife6000) March 2, 2017
Even more keen than usual to set off for school - as Willy Wonka, ready to celebrate #WorldBookDay @cann_bridge school 🌎 📚 pic.twitter.com/TpsyG2dO5d
— Katie Bohannan (@KatieJBohannan) March 2, 2017
My sons world book day costume .. well it is his favorite book !! @Argos_Online pic.twitter.com/mWCv3ob69F
— vicki bowles (@bowlzybowles) March 2, 2017
@BBCSpotlight Amazing Henry the Hedgegnome costume for #WorldBookDay. Now that's what you call a fan! #ChildrensBooks #Plymouth pic.twitter.com/51ac9ylCNt
— Richard Heddington 🐝 (@RHeddington) March 2, 2017
#WorldBookDay #TheVeryHungryCaterpillar @OrmistonPrimary pic.twitter.com/UbOclazW4g
— Sami Veitch (@SamiVeitch) March 2, 2017
#WorldBookDay, the A470. pic.twitter.com/JllCKvYbFq
— The Green Heat Team (@GHT250500) March 2, 2017
Miss Kruger is loving Brooke's World Book Day costume and accessories to match! Super effort! #worldbookday2017 pic.twitter.com/AWIIiCA4BL
— Eastfield Primary (@EastfieldPS) March 2, 2017
Follow Samantha J. Gross on Twitter: @samanthajgross