Escalada increíble

The video tutorial describes how Erick, who is blind, uses a special invention to climb rocks. This invention involves sunglasses with a small camera that sends visual information to a metal square that tickles Erick's tongue, allowing him to perceive his surroundings. With this technology, Erick is able to climb higher and reach the top of the rock, demonstrating the effectiveness of the device.

What does the tickling sensation on Erick's tongue allow him to do?

In what way does the invention enable Erick to climb higher?