I can highly recommend for fans. It's funny when the Tardis disappear on one side of the cup to emerge on the other side during the filling of hot drinks. As long as the cup is hot, the Tardis in the universe holds. Then she slowly reappears on the street. Price a little expensive, but worth it.
It should be noted that the cup may in no case in the dishwasher but may be washed only very briefly in warm water and detergent, otherwise the special coating of the cup for the effect is broken!
