Are you sure that a floor cannot also be a ceiling? Are you absolutely certain that you go up when you walk up a staircase? (M. C. Escher)

Are you sure that a floor cannot also be a ceiling? Are you absolutely certain that you go up when you walk up a staircase?

M. C. Escher

Related topics

certain floor sure walk

Related quotes

The day Apollo 11 landed, I knew men would walk on Mars in my lifetime. I'm no longer nearly so sure. The last budget put forward in Canada contained not a penny for Mars. View quote
Spider Robinson
The only thing I have never done is a Broadway play. I'm not sure I have the discipline necessary to do a Broadway play. I know it holds a fascination for certain actors. View quote
Bob Newhart
I've got a magic charm That I keep up my sleeve, I can walk the ocean floor And never have to breathe. View quote
Maya Angelou
I'm sure Putnam is right that there's been a decline in certain kinds of organizations like bowling leagues. But people participate in communities in other ways. View quote
Peter L. Berger
Celebrate we will Because life is short But sweet for certain We're climbing two by two To be sure these days continue. View quote
Dave Matthews