With red and white light, the shadow of the object appears in the complementary color -- cyan -- and the shadows change as your angle of vision changes.
From a sports perspective, it was a nice change to finally have a single sentence that includes the real objectof the affections by the labor combatants.
The key change was the addition of copper strips to the metamaterial that shields an object from incoming light to create a better material, couple with a slight change in its orientation to solve a problem caused by dividing the metamaterial of the cloaking device into quadrants.
And since a moving object causes a tiny change (known as a Doppler shift) in the frequency of the reflected signal, Silent Sentry can also calculate how fast it is moving.