The illusion of depth perception or another reality.

The world around us is known to us only to the extent that our eyes saw it. If you see a flickering pale orange light in a gray pool of hope then
plunging into another reality and creating your own illusion is easy and simple for you.

The black rustling lines are the hardness of objects, and the gray bluish of the background of the picture is the softness of the transition of reality to illusory feelings.