Yesterday, I finished sewing the Kaleidoscope blocks together, then sewed blocks into rows, and then sewed the rows together. When sewing the pieces together, I figured something out that I wanted to share.
When pressing seams, press the seams in one direction so when they're all sewn together, the seams are either going clockwise or counter-clockwise.
This way, the center lies nice and flat...
...or as flat as it's going to get!
And if you knew this already, good on you.... I was just happy to have figured it out!