input: [CIRCULAR to 1720] Eternal return Time as a wheel Circular [PROGRESSIVE c. 1720-1790] Progressive growth Stages of progress Non-reversible time [PESSIMISM c. 1790-1820] Only short-term progress Dangers and traps Long-term cycles [EVOLUTIONARY c. 1840-1890] Long-term evolution and growth. Time stretches out over millions of years [DIFFUSIONIST c. 1890-1920] Long-term ripples of time spreading out through cultures [0] 
output: TIME
options: P E O P L E
options: T I M E
options: P O W E R
options: M E T A P H O R
options: Q U E S T I O N
options: M O D E L
options: V A L U E