# Impossible object

#### soroban

##### Well-known member

Here's something to drive your friends crazy.

Take a 3-by-5 file card and cut it on the solid lines.
Crease it on the dotted line.
Code:
      *---*-------*---*
|   |       |   |
|   |       |   |
|   |   C   |   |
|   |       |   |
|   |       |   |
|   |       |   |
* - * - * - * - *
|       |       |
|       |       |
|   A   |   B   |
|       |       |
|       |       |
|       |       |
*-------*-------*
Hold section C with your right hand; let the sheet hang vertically.
Hold section A with your left hand and swing it 90o toward you.
Now hold section C with your left hand.
Hold section B with your right hand and swing it 90o away from you.

You will have an object that looks like this:
Code:
                      *---*   *-------*
/   /   /       /
*-------* /       /
|       |/       /
|       |       /
/|       |      /
/ |       |     /
/  |       |    /
/   * - * - *   /
/       /   /   /
/       /   /   /
/       /   /   /
/       /   /   /
/       /   /   /
*-------*   *---*
After you've marveled at how impossible it looks,
. . give it to your best friend.

Last edited:

#### Deveno

##### Well-known member
MHB Math Scholar
i made one of those, and put it in my klein bottle for safe-keeping