Description: This article makes an assumption that might completely change our conception of space (physical) vacuum. If we exist in the Conexisting (con from Latin with âE¦) reality with its formative gravitational field âE" space, then based on the evidence âE"proved principle of symmetry, it would be logical to make an assumption about Antiexisting reality with its formative inertial field âE" space. Its acceptance would be hampered by two conventional absolutizations: 1. Determinacy and single determinacy; 2. Decorated substance. If the Universe has an arrow of evolution from indetermined functionality to determined substance, all falls into place, the Universe takes shape in two linked to each other realities with oppositions of Self-assertion and Self-denial which for overall functionality is quite executable. Only in such way all challenges and paradoxes of Space are resolved including perpetual motion in void space (which does not exist) of giant astronomic substances.