Aha!Clock appears to be some sort of interior object in the first place. When it successfully gets enough of your attention, you may notice the smallest supposed-to-be-still-Landolt-C is actually turning around. Within a moment if you properly wonder why, most likely you should figure out it is a clock right away with a little aha-experience. This clock reminds you how interesting it is like to find out something extraordinary out of something ordinary based on your generous observation.
Can you tell what time it is now? (the view can be zoomed in with your right click)