Witness the incredible restoration of a very old and rusty perpetual calendar, an essential piece ... were carefully restored with precision laser work. The result? A beautifully restored piece ...

In today's video I want to show you how to make amazing perpetual calendar from wood. It shows date, week day and month. The best thing that this calendar never will be out of date! All needed ...

Just when you think you’ve seen them all, someone comes up with something new and unusual, like the concentric rings of this automated perpetual calendar. What we really like about the design ...