video only.

In the first phase, the performer asks the participant to shuffle the logs randomly and form four rows of four-digit numbers. In a split second, the performer calculates the sum of these numbers, which, when verified with a calculator, proves to be accurate.

Transitioning to the second phase, the participant shuffles the logs once more, freely moving each wooden log up or down. This creates a layout where numbers of various digits are added together. Despite the seemingly haphazard placement, the performer swiftly calculates the resulting number.

For the third phase, the participant shuffles the logs again, and the performer, in an instant, calculates the sum once more. However, the result appears incorrect. The performer explains that they were calculating the backside. To everyone's surprise, when the logs are flipped, the sum on the backside matches exactly!

This upgraded version is crafted from ebony and adorned with boxwood inlay, providing a superior feel and comfortable handling. Beyond being a collector's item, it serves as a portable tool for engaging mental performances.

You can introduce the logs as tools you carry around to warm up your brain. After several phases of instant calculation effects, you can seamlessly transition into other routines that demonstrate your mental skill.