An optical illusion with Gradual Gradations 4

Gradual Gradations 4 uses that pink again but this time I've combined it with blue for a very different look.
This optical illusion effect has the light value of each color in the middle. I hope it gives you the effect that it is bulging.
I did this with strip piecing but if you were to ask me how I did it I really don't remember exactly how I did it. I am sure I did draft this one on graph paper before I executed it and probably made "notes to self" about what I thought I should do to make this happen.
This fabric has allowed me to do a lot of create a lot of different effects in my work. This is not the last you will see of creations using where my mirror image hand dyed gradation fabric.
The very simple machine quilting on this piece enhances what is happening with the optical illusion.

I thought it would be fun to play with Corel Photo Paint and create a more extreme bulging effect. This effect could NOT be created with strip piecing!

And of course Gradual Gradtion 4 is the puzzle this time.