You've entered the infamous Frame of Mind, a puzzle of existential horror.
The frame that contains you is a never-ending loop of despair.
There's no escape, no exit, no way out.
The walls are closing in, the shadows are growing longer, and the thoughts are becoming more and more absurd.
Try to find the hidden exit, but don't get too comfortable, it's just a trap.
Solve the puzzle, or lose your mind
Or, if you're feeling brave:
Try to escape the frame, but be warned, it's a dead-end
Or, if you're just here for the aesthetics: