  We study the geometry of universal embedding spaces for compact almost
complex manifolds of a given dimension. These spaces are complex algebraic
analogues of twistor spaces that were introduced by J-P. Demailly and H.
Gaussier. Their original goal was the study of a conjecture made by F.
Bogomolov, asserting the "transverse embeddability" of arbitrary compact
complex manifolds into foliated algebraic varieties. In this work, we introduce
a more general category of universal embedding spaces, and elucidate the
geometric structure of the integrability locus characterizing integrable almost
complex structures. Our approach can potentially be used to investigate the
existence (or non-existence) of topological obstructions to integrability.
