The answer to this question is “Similarity in Appearance“.

The most recent Harry Potter transformation is apparating, which means transferring oneself from one location to another with the speed of a lightning bolt. Apparating is useful for wizards who are in danger because they can transport themselves with ease and disappear quickly. The only requirement for utilizing this feature is that both the wizard and his destination must be in clear sight of each other, allowing them enough time to concentrate on where they want to go together. It is described as “a sensation like being squeezed through a very tight tube”(Harry Potter Page 560) once the wizard arrives at their destination they are also able to pop back out before anyone sees how it happened.