"It's lighter than air" suggests that the shadow has a mass. A shadow has no mass. A shadow is nothing, it is the absence of light. A castle's shadow is not larger than the castle that's casting the shadow if you measure the shadow during midday, and even if it has a long shadow during the evening the castle has a much vaster volume because a shadow is 2D, and you didn't mention whether the size was referring to surface area on the ground or volume. 100 men could move a shadow, they could move the castle which is casting the shadow and therefore move the castle's shadow. They could even put something between the sun and the castle to block out the light and totally remove the shadow.
A cloud is lighter than air, because it floats in the air. A cloud can be larger than a castle. A cloud cannot be moved by 100 men.
I am right, you are wrong.
Fuck.
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