CONCEPTS: catch, fire, microwave

GEN: 3 microwaves cooking something and catching on fire.

CONCEPTS: grow, know, thing

GEN: things you only know if you grew up in a city

CONCEPTS: city, stain, window

GEN: stained glass window depicting builder and children in the cathedral of a city

CONCEPTS: billion, galaxy, year

GEN:
group of galaxies engaging in a slow dance of destruction that will last for billions of years .