Potentially eliminate the need for (not to mention the cost of) additional lighting equipment such as flags, screens and gags?
DSLR Video Shooter’s Caleb Pike demonstrates lighting with mirrors, using cheap materials and household hacks:
The video above is actually a budget-friendly version of The Lightstream System, demonstrated here with specially designed mirrors by its proprietors, Dedolight:
Back to cheaper alternatives, here are five mirror lighting tips from Cinecom:
Back to the original Lightstream system, here’s a case study product demonstration:
And to give a clearer overview, here’s a product demonstration, in miniature (via Lightbridge):
The more conventional studio and theatrical way of creating motivated light involves using gobos with spotlights: