"This light-up box with an interesting pattern of shapes that was available at an estate sale:"
"This is a clock! It's a "TIME SQUARE" ChronoArt clock from the 80s, to be exact. One user also explained how to read it: the 12 squares in the top left represent the 11 hours of the day (12 being blank), the 9 squares on the top right show the minute (0 being blank), and the 5 on the bottom right show 10 minutes (0 being blank), making the time displayed here 4:51."