Old Testament folklore referred to Holy Spirit as the-seven-eyes-of-God -- the number seven not an actual count but indicating a bounty. Today the spiritual presence of God is symbolized by the seven-station Menorah, the age-old trophy of the Burning Bush of Moses.
A delight to those who'll someday return to heaven, God's Holy Spirit is an encompassingly palpable presence unmistakable for any other sort of happening. And yes, when we allow it to wash over us, it is a happening rather than a mere experience.
That's because Holy Spirit encounter displaces all evil around us, washes us in righteousness, assures and uplifts our own spirits and, as some have reported, makes one feel as if floating.
For most of us it's like being off the earth while still here—giving us a hint of home (heaven),—and no one who feels it mistakes it for anything else ever again. In fact the iobserver felt this presence, many times and it settled only on him at both Baptism and Ordination, and no one else.
Plus, he's seen Christian leaders intensely jealous of any who demonstrate God's Holy Spirit other than they, as betrayed by the fear in their eyes and desire to be rid of him.