Give this little oddity a spin on its horizontal axis, and watch it stop, and reverse!
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A science curiosity whose ancient and mysterious properties capture the imagination of all ages. Give this little oddity a spin on its horizontal axis, and watch. If spun in the non-preferred direction, the Rattleback becomes unstable, "rattles", stops, and unbelievably, reverses its spin to the preferred direction. Spooky... Does the Rattleback really violate the angular-momentum conservation law of physics, like it seems to?

Age: 7+

What you get

One coloured Rattleback. Colours vary.

How does it work?

The Rattleback has a very specific shape - flat on top and an asymmetrical ellipsoidal bottom - which is believed to cause its curious preferential spinning. Its motion has been studied by many scientists, but the exact reason for the Rattleback's odd behaviour remains ellusive. The best explanation is that the long axis of the ellipsoid is not parallel to the long axis of the flat top - hence its predisposition to spinning in one direction. Some exceptional rattlebacks will mysteriously reverse when spun in either direction. Go figure!?

Originally made from wood with decorative carvings and patterns, this modern Rattleback is made from brightly coloured, smooth acrylic. Rattlebacks have all sorts of myths associated with them, and are also known as an "anagyre", "celt", "Celtic stone", "rebellious celt", "rattlerock", "spin bar", "wobble stone" or "wobblestone". The rattleback has excited human imagination since prehistoric times, so let it excite and inspire you!


  • Flight Dynamics (Rolling and Pitching)
  • Force and movement

WARNING: CHOKING HAZARD - Small Parts. Not for children under 3 years.

More Information
Length (cm) 9
Width (cm) 2
Height (cm) 18
Age Group 5-6 Years, 7-8 Years, 9-10 Years
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In some cases we may need to apply a shipping surcharge to large or fragile items, especially to remote or non-urban locations. You will be contacted by us for confirmation if this additional charge is applicable.

How long will it take for my order to arrive?.

You should receive your order within 2 to 4 working days, although to some regional and out back areas it can take up to 2 working days longer. Orders going to WA also take a little longer, up to 6 working days.

All standard orders are shipped using Australia Post's eParcel service, so you'll be kept fully informed of the progress of your order during its journey to you. Aside from receiving regular email updates, you can enter your tracking number into Australia Post's website at any time for information about the delivery status of your order.

International delivery will take from between 1 to 4 weeks depending on the destination and potential customs clearance delays.

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We ship every Victorian business day. Orders received and paid for by 12pm AEST time will generally be shipped the same day.

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We ship to both Australian and International customers.

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The majority of orders are shipped using Australia Post's trackable eParcel service, with larger orders being sent by national courier.

We also have options for express or registered post. A number of international delivery options are also available. These can be selected during checkout.

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