In my library of Patchwork Jigsaws this blocks full number is 1234 1234 1234 1234 which is based on the direction the quarter circle faces in each quarter of the block. Here are two often used colorizations of the block.

And something a bit more adventurous.

Yes, exactly the same blocks, but with the colours. Even if you had not had an alcoholic drink in your life this would cause a few headaches resembling a hangover!

Much less of a headache with the one above.

And something much simpler as the last design for today.

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