in my time frame, yesterday is the time period between my two most recent sleeps, today is the interval between now and the next time i go to bed, and tomorrow is the next time i wake up. this gets even better when the ‘change direction’ cards turn up, which changes the direction of play and the direction of counting! my uncle gave me an extra one he had. we also cut 7 small rectangles to top the rows to label the days of the week. another common type of stairs was the ‘spiral staircase’. 