This particular census involves the individual contribution of half shekel of silver by every adult for the construction of the Sanctuary. This has two objectives: to be aware that we as individuals are incomplete (halves) because our wholeness is achieved in our unity with the Creator. Hence we have to offer our individual being (the half we are) for the foundation of what symbolizes our unity with God: the Sanctuary as the highest awareness of Him.
This process takes place when we embrace God's ways and attributes in the material world. After the final instructions for the construction of the Sanctuary and its anointing, there is a repeated reminder.
The power of ego granted by the Creator is meant to serve Him, but this depends on our free will: either to follow our materialistic desires or love's ways and attributes. In this situation our higher awareness of His presence is responsible to lead every aspect of consciousness in His direction.
In the permanent awareness of love we redeem ourselves from the ordeals imposed by ego's materialistic agenda. Once we integrate all levels of consciousness into God's Love and follow His ways, redemption follows. This unity is achieved in the awareness of His attributes.