First, in case you are as confused as I was, a "Tumbler" quilt is  completely different from a "Tumbling Blocks" quilt! 

"Tumbling Blocks" are made from 60 degree triangles and diamonds, and wind up with a 3D effect. They're great fun to look at, but technically can be a bear to make. I don't even remember how I pulled off the blocks below, from a Tokyo-themed quilt I made in the 90s, called "Sushi in the Sky with Diamonds." 

I must have had a much higher tolerance for mitering in those days. On that same quilt, I also ...

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