Castle In The Air is a nine patch block where all of the square subunits have been swapped for other pieced units. It is an advanced sewers block.
The four corners are Half Square Triangles
The centre square is a square with a square
The four side pieces are a mixed unit with quarter square triangles on one half and half square triangles on the other -one day I'll find the proper name!
For those of you who want to make your own block and choose the size here is how to draft the block - the grid is the finished size of the subunits (i.e. minus the seam allowances). If the idea of maths puts you off then skip to the bottom of the post for the links where someone has done the work for you 😀
In order to draft the Castle In the Air block first start with a nine patch grid.
The central square is a square within a square subunit. The diagonal lines are formed by joining the centre of each side of the square with the centre of the adjacent side.
For each of the side squares draw a diagonal line to turn it into a half square triangle - make sure these all go the same way (similar to a friendship star)
Draw a line from corner to corner in the other diagonal from the outisde towards the centre BUT stop at the previous diagonal line - don't go all the way to the centre.
Click here to go to page from Patchwork Square
https://scissortailquilting.com/quilt-block-library/air-castle-quilt-block/ - includes colouring pages
Quilters cache has instructions plus example layout
https://www.quilterscache.com/C/CastleInTheAirBlock.html
And finally a Youtube video on how to construct the block
Or here from Patchwork Facil
and another two from cut and create
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