day and night

adv

1. All the time; round the clock; unceasingly.

   “Oh that my head were waters, and mine eyes a fountain of tears, that I might weep day and night for the slain of the daughter of my people!”

   “We were firing at top speed day and night on counter-battery work, neutralisation, and aeroplane shoots, and all spare men were commandeered to help feed the guns.”

name

Etymology: Named for the fact that the rule is its own complement; toggling all cell states results in the pattern evolving similarly, but with living and dead cells switched.

1. A Life-like cellular automaton with the rule B3678/S34678.

noun

1. Synonym of chalk and cheese (“two things that are very different”).