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Description
Principia by Harapan Ong - BookSingapore's Harapan Ong has caused an online sensation with his technical abilities. Videos began to circulate some years ago showing a pair of hands doing extraordinary things. His style is natural, unassuming, and soft. But Aces appear, selections transpose, and magical things just seem to happen in Harapan's hands. Principia is our very favorite kind of magic book: the kind of book that you pour over every page, trying out each and every piece
Singapore's Harapan Ong has caused an online sensation with his technical abilities. Videos began to circulate some years ago showing a pair of hands doing extraordinary things. His style is natural, unassuming, and soft. But Aces appear, selections transpose, and magical things just seem to happen in Harapan's hands.Principia is our very favorite kind of magic book: the kind of book that you pour over every page, trying out each and every piece inside. EVERY single effect in the book (and there are 60 effects described) is practical, fun and radically new.
The concept of Principia is a magic book fused with a scientific paper on physics. By day, Harapan is a physics teacher and he uses the same laser-focus and precision in both his career and his magic. The results are magnificent.
Harapan's specialty is the under-the-spread cull, and he has created several new techniques in association with this classic tool. The book also features impromptu magic, gaffed card magic, and dead-on easy tricks you can do the first time you try them. We predict that Principia will be the most talked-about card book of the year, and that it will be studied and returned to for many years to come.
Hard cover. 253 pages.
"Wonderful!"
- David Williamson
"My favorite magician."
- Stephen Long
"Buy it!"
- Tony Chang
"Buy the book."
- Kevin Ho
"The most beautifully constructed card magic I've ever seen."
- Henry Harrius
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4.8 ★★★★★
Based on 248 reviews
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Product Reviews
★★★★★ 5
No problems after a year and a half
Color: Dogwood & Calming, Size: Medium
Have been regularly buying these for my corgi for about a year and a half. The 2 pack lasts about a month or 2 each time. Pieces break off in small enough pieces that they safely pass through his digestive system. He gnaws each one down to about 1/4 the original size before we take it away and give him a new one. He continues to have regular bowel movements and has a healthy appetite so I can’t imagine any problems arising after so long.
I have tried other alternatives and every other similar chew breaks off in larger pieces and didn’t feel comfortable letting him chew/eat them. I noticed there are a few 1 star reviews saying their dogs got sick off these but after a year and a half I have had 0 issues with this product. I guess it depends on the dog and how big of pieces they are swallowing. My dog ingests pieces about the size of a grain of rice so just pay attention and you should be fine.
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Reviewed in the United States on February 18, 2026
★★★★★ 5
Long lasting and safer alternative to sticks
Color: Dogwood & Calming, Size: Medium
These are great, very durable, and have lasted a very long time. Much safer for my dogs than the random sticks they find in the yard. They do get shorter with chewing eventually, but they don't break off in little chunks like I've seen with some nylon chews, and they don't splinter like wood. Medium size works well for both my 16 lb Cavalier and my 60 lb Pyrenees/Golden mix. They're both moderate-to-aggressive chewers, though size obviously affects how much damage they can do.
I wish you could buy the hemp chew separately because that one is very much a favorite in my house, so after 2 years and 2 purchases, I have barely any left of the remaining hemp chew, but still 2 of the dogwood chews that neither dog is as interested in anymore. I'd love to buy a couple more of just the hemp one.
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Reviewed in the United States on April 30, 2026
★★★★★ 5
Your dog will thank you.
Color: Dogwood & Fresh Breath, Size: Large
My dogs loves to chew on these. They make a small mess but not as bad as other chews. They are food for keeping teeth clean.
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Reviewed in the United States on May 31, 2026
★★★★★ 5
Nice chew toy
Color: Dogwood Mushroom, Size: Medium, Color: Dogwood Mushroom, Size: Medium
Super durable and puppy loves it. It was a bit hard for her at first but now at 5 months it’s one of her favorite things to gnaw on! It is heavy for the size but seems to be great quality and has given many hours of chew time with minimal wear.
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Reviewed in the United States on March 12, 2026
★★★★★ 4
Long lasting
Color: Dogwood & Calming, Size: Medium
My dogs love these bones.
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Reviewed in the United States on March 25, 2026