What is "flashcube"

Usage examples of "flashcube".

Just that purple-red flash, as if someone had popped an incredibly intense flashcube in her face, and then she had blacked out.

This impressed visitors and looked nice for the tour groups who came by every hour to launch flashcube barrages over the velvet rope.

I loved the way the burned-out flashcubes of the Kodak Instamatic marked a moment that had passed, one that would now be gone forever except for a picture.