  We construct the E theory analogue of the particles that transform under the
Poincare group, that is, the irreducible representations of the semi-direct
product of the Cartan involution subalgebra of E11 with its vector
representation. We show that one such irreducible representation has only the
degrees of freedom of eleven dimensional supergravity. This representation is
most easily discussed in the light cone formalism and we show that the duality
relations found in E theory take a particularly simple form in this formalism.
We explain that the mysterious symmetries found recently in the light cone
formulation of maximal supergravity theories are part of E11. We also argue
that our familiar spacetimes have to be extended by additional coordinates when
considering extended objects such as branes.
