Picture of Office Cube Hour Glass
In my last full time employment I found myself in a nondescript cube counting down the hours to lunch and then till quitting time.  There were four hours till lunch, a one hour break and the another four hours till the end of the day. It varied very little from that. There were conference calls to take up some of the time, but I realized  I was just counting down four hours and repeating it after lunch. So I devised an animated hour glass. The display is an 8x8 LED matrix representing sand dripping through an hour glass. It takes 4 hours. Then the whole display rotates 180 degrees in a one hour period, after which the animated sand displays again for 4 hours. The Arduino does the counting, displaying and servo control. During development I added a "demo" switch to show the display and servo operation in a shorter time span.
Once the code was worked out with a friend's help, it was wired up on a breakout board.The prototype uses an Arduino Uno; An  Adafruit LED matrix and backpack. This way you can use I2C for driving the display with 4 pins; A servo from Parallax as I needed one that could rotate 180 degrees. I tried a simple RC servo, but it did not rotate 180 degrees only 90. To use "Demo"  mode, hold down the pushbutton while applying power or pressing the reset on the Arduino board. The Matrix will scroll  "DEMO MODE"