Section 2 Periscope

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Looking at the grey colors of your periscope, is that by accident? Or did you apply colors?

Because dark grey, often means, the object is in trouble, you faces are in the wrong direction (inside, outside face normals).

You can fix that easily;
Go to edit mode.
Press ‘a’ to select all.
Press ‘Ctrl+n’, to recalculate outside.

Just my 2 cents …

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