Timepieces are capable of communicating more information than the mere numerical notions of the hour and minute: the Sun Set Solar Image Clock, for instance, displays the path of the sun in relation to the horizon.
This creation by Andrea Ponsi and Alessandro Belli manages to be both scientific and poetic. The unusual annual comprises a rectangular panel with a tight grid; the hours of the day are found along the x axis and a horizontal bar can be adjusted up and down the y axis to match for the month of the year and the local latitude. This is the literal threshold between night and day.
A tiny red dot rises and falls along the sine curve and the minutes can be read on a central dial. The Sun Set Solar Image Clock captures some of the experience of the passage of time as it pertains to periods of lightness and darkness.