Accessing either Apokolips or New Genesis usually requires a form of travel known as a "Boom Tube", a portal generated by a device known as a Mother Box. In some versions, the boom tube actually converts the size of individuals that pass through to proportions fitting the destination, i.e., when a New God passes from Apokolips (or New Genesis) to Earth, they shrink in size, while someone going the other way would grow larger. If someone somehow reaches the Fourth World by other means, they will discover that its denizens are giants.