Wooden Toys, innovative baby toys, celebratory gifts inspire creativity. The right brain sparks: see, touch, feel. Toys excite the five senses. (Ginga Kobo Toys)

REULEAUX TRIANGLE Wooden Toys (Ginga Kobo Toys) Japan

Rakuten Super Points
Buy it and earn 25 Points!! Details
Alipay OK Details
$ 21.76 (¥ 2,592)
Actual price may vary according to exchange rates.
Payment will be charged in yen
3.75 out of 5 stars

Sold Out

This page is a simplified version of an original Japanese page.
See the original page
Payment Options: Details
Credit Card, Alipay


Within four corners of a wood block is suspended a triangular heart. The heart rotates on an off-centered axis, it lacks constant continuity at 3 points. The heart is rotated by a wooden knob located behind the box which holds the heart.There is nothing complicated about this toy. It is just a mysteriously mesmerizing rotating heart. What do you think? Empty your mind, enter an enigmatic world of illusions. This Reauleaux Triangle is wonderful toy.

Have you heard of the Reuleaux Triangle?
This heart-like triangular shape is not just a triangle.
Pardon the digression but may I ask ,"Why is a manhole cover is round?" Difficult question? Well, let's see..." The roundness of the manhole cover insures the same fit whichever way it is placed, whereas a square or triangular shape would fall into the hole it is made to fit if not placed correctly.
There is another shape which like the round manhole cover, will not fall, if placed incorrectly, into the hole it is fitted to.
Regard the "Reuleaux Triangle", a triangular heart-like shape which acts like the round shaped manhole cover .
Known as the father of Applied Kinesiology, Monsiuer Reuleaux from France , discovered what is referred to today as the "Reuleaux Triangle"。
In the world of mathematics, the " curve of constant width", generated by joining circular arcs centered on the vertices of the triangle, is the reason why the Reuleaux triangular shape like the round shaped manhole cannot fall into it's own hole.

The Reuleaux Triangle has gained fame from use in the automobile rotary engine and a special drill bit for making squares. You might say what nonsense! How is it possible to drill a square hole? But wait, take a look at this toy! Reuleaux's triangle heartlike shape turns in the middle of the square.With the special Reuleaux triangular shaped drill bit it is possible to hollow out the shape of a square, a square with rounded corners that is. The drill bit is positioned at the center of the square, it is then maneuvered out in a circular motion toward the edges of the square. The hollowing out capability of this special drill bit is thanks to the Reuleaux Triangle.

wooden toys
● Orders for name engraving service please click here

Size Length100mm×Width100mm
Materials Beech
Painting German Paint "Osmo" & "Planet Color"
Compliance With European Standards

Rakuten International Shipping Services
Refer to chart below for shipment details
Weight Product weight (0.23kg) plus weight of packaging
Delivery charges Please click here
Special Attention Shipping costs may vary. Total cost of the product/shipping will be reconfirmed by Ginga Kobo Toys via e-mail before actual shipment.
●Payment method by credit card or paypal.
●Delivery method by Rakuten International Shipping Services. Please click here

wooden toys

wooden toys

Beware of toys which have become chipped or broken, lost their orginal shape or have cracked painted surfaces. Also, these toys are handcrafted the actual toy may look a little different than the display photo. Although safety paints which are in compliance with european standards are used for all the toys rendering them safe to put in a childs mouth, it is the request of Ginga Kobo Toys that young children are carefully observed when they are playing with our toys. Ginga Kobo Toys does not take responsibility for misuse of our toys.

Copyright (C) GINGA KOBO TOYS All Rights Reserved.

Latest Product Reviews (4) Translating... Translate Product Reviews

Posted by ky*******, 2014/08/08 11:08:30
Posted by きな***, 2014/06/07 07:28:52
Posted by ノッ*****, 2012/10/30 09:11:34
動きは予想通り、考えさせれるとても良い物でした。しかし、色・質感が写真で抱いたイメージと違い残念でした。 色は、もう少しキツネ色に近い印象です。ニスのためでしょうか。写真の色や木目から、ブナのような無垢で白っぽいイメージを抱いていたため、「材木自体が違うのではないか?」と思えてなりません。 外周も、茶色っぽい(薄い板を何枚も重ねたような)筋が目立ちました。その一部が小さく欠けて穴があいており、正直気になりました。 丁寧にやすりがかけてあるので、肌触り自体は良好です。たまたまそういう部位(年輪)だったのかもしれませんが、色味等の参考になれば。 ↑上記レビュー後すぐに連絡をいただき、たまたま数日前に商品の仕様が変更したばかりだったと教えていただけました。写真も現行の物に素早く変更され、とても信頼できる誠意の感じられる対応でした。このお陰で友人へプレゼントする日が楽しみになりました。良い買い物ができたことに感謝!

Recently Viewed Products

Payment Options:

Credit Card We accept credit and debit cards.
The following credit and debit cards can be used:
•American Express
Alipay The “Payment Amount” is calculated as below. “Payment Amount” = Product price total + shipping fee Upon confirming your order, we will send you a link to make a payment via Alipay’s secure payment page. You must finish the payment process before the deadline to complete your order. Please check the payment process from the link here. PC: http://global.rakuten.com/en/help/payment/alipay_pc.html Smartphone/Tablet : http://global.rakuten.com/en/help/payment/alipay_mobile.html

Not available for Overseas shipping

This product cannot be shipped to Us United States from the store.

Please contact the store for further information.


"Delivery Rates : EMS (International Express Mail Service)"

Ship to
Shipping Method
Note: Exchange rates are for reference only.