There are a few maths clock options out there for the discerning temporal number fan. But this one is our favourite because it doesn't show you equations for the the standard hours of 1 to 12. No, instead of showing you boring-o'clock it shows you times like \(\sqrt{e^\pi}\)-o'clock and \(\zeta(3)\)-o'clock. Nice!

You can see our very own Matt Parker took the pictures. And is that a cat in the background or...?

The clock is 250mm in diameter and wall mounted.

Price = p₃₂₇ pence = £21.79