What does it mean that you can never go up the Devil's Staircase?

Penrose stairs is a famous geometric paradox. It refers to a staircase that always goes up or down but never ends. It can be regarded as a variation of the Penrose triangle. The body, on this ladder can never find the highest point or the lowest point. The Penrose Ladder was proposed in 1958 by British mathematician Roger Penrose and his father, geneticist Leonid Penrose.

What's the explanation of "the cloud comes out of the hole unintentionally, and the bird is tired and knows"?

Exquisite sentences for tasting tea

Famous quotes from the Spring and Autumn Period and the Warring States Period

Little House on the Prairie is a good word and sentence

There is a saying in Conan that we are angels and sometimes demons, and we should make them. . . . . .

Famous sayings, beautiful classic quotations

Famous aphorisms that encourage people to face difficulties bravely (preferably more) ~ ` ~

16 Three famous sayings of American President Lincoln.

Personal growth quotes and aphorisms

Japanese Warring States Novels