  We examine the challenge of viewing all the fields in supergravity as arising
from a Kaluza-Klein like dimensional reduction of some higher-dimensional
theory. This gives rise to what is known as exceptional field theory or double
field theory. A particular emphasis is placed on following the Kaluza-Klein
intuition leading to the identification of charged states and a
reinterpretation of the central charges. We further give a description of the
novel extended geometry as a generalised phase space and the relationship to
string and M-theory theory and the notion of quantization
