The theory of relativity is a tricky one. Firstly, because the author openly admits that he only partially understands it and has his problems with the curved time axis. Secondly, this theory relates mass to velocity and thus calculates the energy equivalent. As simple as E = m c² looks on a T-shirt or on paper, it becomes quite complicated when you do the math.

The speed of light, called c, is 299,792.458 km per second. That's already quite a lot of numbers. Now you have to multiply them together. Even if you omit the commas, the result is quite long: 89,875,243,264. You would then have to multiply this number by the mass.

But that's not possible because the cell phone has too few digits. Therefore, the author has decided to accept the theory of relativity without question.

However, the Longines wristwatch presented here also exhibits a growth curve similar to the theory of relativity. It was presented as a gift to Professor Albert Einstein on February 16, 1931, and was auctioned at the Antiquorum auction house on October 16, 2008.

Here, it changed hands for the incredible price of $596,000. Unfortunately, the starting price of this gold Longines watch is unknown. However, from a technical perspective, even without a cell phone, it's possible to calculate the increase in value at rates similar to those found in the theory of relativity.

Not to mention the immense advantage that this watch – contrary to theory – handles time in a very orderly manner and displays it in a classic linear manner.