There are 24 fabrics in this Trip Around the World so I needed to unpick 24 loops to be able to decide what will be the center. In this photo it would be the lavender.
I can move the strips from the left edge to the right edge and see every fabric as the center. Look at the bottom right corner above as it changes by one square in each photo.
Since I had predetermined that I want all 4 of the same color as a center I just took photos of a set of 4 strips moved to the right until I had seen every color as the center.
This last photo shows the last color as the center. I think my two favorites are the lavender and the yellow as centers.