I created these Moebius strips for an Illustrator training on Lynda and it was a bit mad. The Instructor Deet McLellan is a bit everywhere and goes too fast! I had to redo it and take notes lots of times. But I did it in the end, and I am so happy! It's a fake 3-D, created exclusively with gradients (that can be seen in the 1st picture). Versions in green and pink and their inversions are displayed here (I especially like these). I have to study more, but I think they look nice nonetheless.