Can you tell us what vertical line is longer? Post your answer in our comments.
Try this out, and experience natural hallucination. Stare at the center, keep your eyes still & look away when instructed. Don't worry, this isn't one of those lame "something pops up & scares you" videos.
Try to say the color and not the word.
Don't believe it? Try opening up the image in Paint or another image editor and put the 2 tiles side by side.
Stare at this image close up for 60 seconds then lean back and close your eyes. You will see an image of Jesus. This one is freaky.
Do you see an Eskimo or an Indian?
I bet you get this one wrong!
These lines are actually parallel even though they appear to curve.
KST can only see about 14 cubes.