There’s this “game” that plays with time perception called Unlock the Mysteries of Time Perception. Rather interesting to experiment/test myself as I got to know how I perceive time.
A project called Time Wizard that revolves around the idea of tricking and distorting one’s perception of time through activities that can be found in the toolkit.
Another is about optical illusions and I personally found the grid amazing! So was Einstein too.(Thatcher was rather scary..)