FREE Shipping to US & Canada!

On orders over $99. Code: FREESHIP21

Download a FREE Solution for your puzzles!

Vanishing Line
Click Image to Enlarge

Write Review Write your own review!

Vanishing Line

$ 16.99 CAD Canadian Flag

Your Credit Card company or PayPal will automatically convert* the Canadian Dollar amount into your local currency.

Currency Converter: * Exchange rates shown above are estimates only, and may vary slightly from the rates charged by PayPal or your Credit Card Company.

Product Information

ObjectCount the lines - are there 12 or 13?
DifficultyLevel 7 - Challenging
BrandCreative Crafthouse
TypesMore Wood Puzzles, Dave Janelle
Dimensions7.7 cm x 17.3 cm x 1.3 cm / 3 in x 6.8 in x 0.5 in
PackagingShrink Wrap

Product Description

Look at the 2 pieces of wood and you will clearly see 13 horizontal lines.

Yet flip the frame upside down and there are only 12 lines!  How can this be?
Some call this the "Sobriety Test", yet there is an interesting math basis for the puzzle.
The idea for this wonderful illusion came from one of Martin Gardner's recreational math books.  Good for messing with friends, or a coffee table/bar type item, or effective in the math classroom also.
Pieces are made from 1/4" thick hardwood, either maple or cherry.  Base is made from floorboard material so it is very strong.
Size of the puzzle in base is 7" x 3.25" x 0.6"

Customer Reviews |

Review Icon Write your own review!

This item has yet to be rated