When testing those claiming to be able to see auras around people's heads, magician James Randi issued this challenge: "Then if I were to step behind a wall barely taller than I am, you could determine my location from the aura visible above my head, right?

The type of challenge that Randi presented shows his empirical approach.

Explanation:

The approach that Randi bears tends him to seek the logic behind the happenings and possibilities that sound or appear illogical. This intelligent approach of challenging apparently false and illogical claims is referred to as the empirical approach. This approach demands solid evidence or proof to associate trust with the claims that are made of supernatural things that lack a scientific basis.