The discussion established that while the B-2 may occasionally be detected by some radars, its stealth technology reduces the radar cross-section of the B-2 to the point where radar tracking of the requisite continuity and accuracy is impossible.
By staggering the point at which each part of a cross-section is solidified, there is greater opportunity to provide structural support for each feature.
His cramped Houston apartment gets the point across by having no wall between the young couple and the widow, and his cross-section of a bus in front of a starry sky is visually clever.