Difference between 1st angle and 3rd angle projection?

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1st angle projection is where the object is placed in the first quadrant, while 3rd angle projection is where the object is placed in the third quadrant.

1st angle projection is commonly used in Europe and Asia, while 3rd angle projection is commonly used in North America.
In 1st angle projection, the object is imagined to be in the first quadrant and the plane of projection is between the observer and the object.
In 3rd angle projection, the object is imagined to be in the third quadrant and the plane of projection is behind the object.
1st angle projection is more intuitive for designers as it represents the object as it would be seen by the observer, while 3rd angle projection requires mental rotation to visualize the object.
In 1st angle projection, the top view is placed above the front view, while in 3rd angle projection, the top view is placed below the front view.

Difference between 1st angle and 3rd angle projection?

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