How does the sun shade on this space helmet fit into the helmet?

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The discussion centers on confusion regarding how a sun shade fits into a helmet, particularly when observing its shape and rotation around the deployment knob. The user expresses difficulty understanding the fit due to the curved design of the shade. Another participant clarifies that the issue arises from perspective distortion, explaining that the front of the shade appears larger because it is rotated towards the viewer. This perspective illusion can make the back of the helmet seem misaligned with the shade. Ultimately, the confusion is rooted in the challenges of visualizing 3D objects in a 2D format.
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Okay, I realize I'm a bit stupid, but how does the sun shade on this photo fit into the helmet? I mean, it OBVIOUSLY does, but when rotating the shade shape around the knob that deploys it, it doesn't appear to fit in the back of the helmet.
Even though they're curved, it doesn't seem to make sense to me.

Cheers.

Side view: http://flic.kr/p/9ajwWP
Front view: http://flic.kr/p/9anKU5
 
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It's just an illusion of perspective, trying to project a 3d object in 2d when it isn't oriented perpendicular to you - the front is rotated toward you, making it appear bigger than the back.
 

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