Orun Si is a song through the divine inspiration of the Holy spirit, "Open Heaven” means an unblocked and unclosed access to where God lives, which is heaven. We could also say that it is an unrestricted access to a state of supreme bliss.If the Heavens are open, we will have access to the treasures God has in heaven and we will be blessed. May the God of heaven bless us as He opens the heaven and cause us to soar to a higher level in our walk with Him in Jesus’ Name. Shalom.