It makes me think - 'why is it still dark outside the window when I've been awake 17 hours - I'll have to go out and find out - it should be daylight by now. Interval......hmmm............interval.........hmmmm.............in music thats 'a rest'.............hmmmmm illusion.........hmmmmm......illusion is something that appears real but is not.hmmm.....maybe I'm working too hard....... ?