The mage can make an opaque object transparent or vice-versa, or he could choose to affect only one surface. He could, for example, make the outer surface of a bank vault door transparent, allowing him to see the mechanisms within.
At this level, the mage must touch the targeted object (although he can do so using forceps or other tools).
With Matter ●●●, he can cast this spell at sensory range.
Guardians of the Veil Rote: Gaze through the Mountain
Sometimes, a Guardian is an investigator, sometimes an assassin, and impact. The exact method of protection varies from mage to mage and attack to attack. The effect is the same, though: a general protection from almost all sorts of physical harm.