A clock is a decorative item for a wall, table or mantle.
"Wait a minute!", you might say, "It's for telling you what time it is." Well, that was the original idea behind clocks. But nowadays, people do goofy things with them, setting them any number of minutes ahead and doing it differently in various parts of the house. People are too lazy to reset their clocks for Daylight Saving and the ones that do reset their clocks the wrong way half the time. And nowadays people don't care if they're late for an appointment, which is why are sitting in the doctor's office looking at this on your phone.
With this general lack of regard for time, scientists note that time slips are more common than ever. However, they are not reported as no one cares if they end up in the 18th century so long as there is chocolate there.