Background Wall Requirements (Third Part to Terraria Housing Mechanics)

This is a third part to this post:


I sampled my pictures from this post:


Explanation

This is from the Official Terraria Wiki:

In other words, any Open Space within a house that exceeds 4 Blocks in height or width needs Walls to fill-in the gap and act as a “Block” in order to make it valid.

  • This rule is also applicable in the creation of valid bedding.

Examples

Invalid
There is a 1x6 Area of Open Space at the top.
Capture 2020-07-16 22_56_12

Valid
There is no Open Space that exceeds 4 Blocks in height or width.
Capture 2020-07-16 22_53_42

Note

  • You can increase the area of a house without exceeding 4 Blocks in height or width with the type of intersection boxed in green.

Valid
There is no Open Space that exceeds 4 Blocks in height or width.
Capture 2020-07-16 22_52_45

Invalid
There is a 5x1 Area of Open Space at the top left and a 5x1 Area of Open Space at the bottom.
Capture 2020-07-16 22_55_30

Valid
There is no Open Space that exceeds 4 Blocks in height or width.
Capture 2020-07-16 22_53_01 (1)


Challenge

Figure out why these two bedding areas are valid.

Answer

There is no Open Space that exceeds 4 Blocks in height or width.

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