Seeing orbs is quite common and many people have captured these luminescent spheres in photographs. It's thought that each color of orb has a different meaning, and that the energy that is captured within them carries a message from the spirit world.
While Light Orbs are usually seen as angels or spirits of the deceased, Black Orbs are much rarer and generally considered to be more malevolent. The reason for this is that they vibrate at a lower frequency than other orbs, and therefore they may be more connected to negative energies.
Blue orbs are often associated with peace and guidance, so when you see one it's a sign that you need to focus on the spiritual aspects of your life for a while. It also suggests that you should spend some time meditating in a quiet place.
Purple orbs are a sign that someone who loves you is nearby or thinking of you from afar. They also suggest that you should meditate in a place of healing and rebirth.
Burgundy orbs are a sign that wealth and prosperity are close by. They can also indicate that you will receive assistance from a guide or an angel.
A few niggling flaws do mar Pulsations from the Black Orb, such as the instrumental opening and the mid-platter interlude. However, the ferocious death metal that comes to roost in "Blinding the Seven Eyes of God" and the Demilich-descended riffing of "Teleport Haze" more than make up for them.