Electrons moved in two dimensions when influenced by a magnetic field, hinting at how a similar effect would occur in the fourth dimension.

POSSIBLY the question, What is the fourth dimension? may admit of an indefinite number of answers. I prefer, therefore, in proposing to consider Time as a fourth dimension of our existence ...

Stunt artist Terry Walsh had to dive into the water to retrieve it. Romana traces the fourth segment of the Key to Time to a statue. The segment is disguised as a stone dragon, part of the statue.