interlocking squares quilt block

Interlocking squares quilt block


This is an interesting quilt block – I always like blocks that give an optical illusion.  I’ve made it here as a 16″ block with a plain white centre, but of course you could use this block to fram a photo or a star.



Cutting requirements

four 2.7/8″ squares each of light pink/purple, two squares each of blue/dark pink, two squares each of blue/light pink, two squares each of light pink/white and two squares each of dark pink/light pink

twelve 2.1/2″ purple squares, four 2.1/2″ squares in each of blue, dark pink and white

four 4.1/2″ by 2.1/2″ white rectangles and the same again in purple.

Making the quilt block

making half square triangles

Making half square triangles


Make half square triangles with all the 2.7/8″ squares.  Place two squares with right sides together and mark a line along the diagonal.  Sew a 1/4″ seam either side of the marked line and cut along the line.  this produces two half square triangle units.



Interlocking squares quilt block layout

Interlocking squares quilt block layout

Lay the patchwork pieces out in eight rows of eight (that’s counting the rectangles as two squares).  I have used the white rectangles in the middle of the quilt block and the purple rectangles in rows one and eight.  Once you have laid out the dark pink squares and triangles in threes and put the purple/pink half squares half way along each edge, the rest of the squares are fairly simple to place.



interlocking squares quilt block bottom half

Interlocking squares quilt block bottom half

interlocking squares quilt block top half

Interlocking squares quilt block top half


Sew the squares together across each row.  As you can see, the last four rows are in fact the same as the first four, just placed the other way up.  Sew the rows together to complete the interlocking squares quilt block.


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