This is a vision of Christ as the center and multitudes of rejoicing people surrounding Him, protected by the petals of salvation and righteousness. The color red in the petals symbolize the blood of Jesus, the color white symbolizes the righteousness of God. The green pool symbolizes the healing power of God.

“But God commends His love toward us in that while we were yet sinners Christ died for us. Much more then, being now justified by His blood, we shall be saved from wrath through Him. For if when we were enemies, we were reconciled to God through the death of His Son, much more, being reconciled, we shall be saved by His life. And not only so, but we also rejoice in God through our Lord Jesus Christ, by whom we have now received the reconciliation.”
Romans 5:8-11