The smoothest travel experience in the world – The Shinkansen, average delay from schedule per train is 54 seconds. The record, in 1997, was 18 seconds.
One of the smoothest material there is for me is processed wood.
Eggshell is one of the most pleasant smoothest feelings against the skin. (Something I learned from working with some blind children).
I’m very much a “pudding girl” and there aren’t many desserts that are so smooth as a great Crème Brûlée.
Always take hold of things by the smooth handle.