Perhaps I stared too long at a clock this week, but I suddenly had an idea for a block featuring a circle cut in half and half again. (Or maybe I was inspired by last week’s split quarter-square triangle block.)

I imagined using some bright colours in the design, but instead settled on this dark green with an orange. I love the bright pop of colour against the murky background.

You can see if I rotate the circles, new secondary designs (squares) appear.

Or I can rotate the designs to create ’empty’ squares where the filled squares were.

Or just rotate randomly to create a bit of disorder. (Although if you look closely, you’ll see there is order here: the first and third rows are the same, as are the second and fourth rows. This makes each quadrant of 4 circles the same, too.)

This is just a single block in a 4 x 4 layout, surrounded by a wide border on all sides. It could be created in four quadrants, or perhaps one semicircle and two quadrants. There are lots more ways you can rotate the blocks, or use colour to create secondary designs. Endless fun!