The two are combined to make what I call an Echo block.
There are 16 ways the two can be combined.
I chose this way
However, the sewing is simple and the pieces can easily be mass produced.
So it's easier than it first looks.
When I rotate 4 of the larger block I get this quilt design.
This time it looks more modern.
I'll let you to explore the other 15 possible Jacob's Ladder Echo blocks.