[rob74]

Speaking of Fresnel lenses, one of the coolest applications is a plastic "wide-angle lens" sticker that you could affix to your car's rear window (https://www.amazon.de/-/en/WIDE-ANGLE-WINDOW-FRESNEL-OPTICAL...) to increase the field of view. Their popularity has dropped since the advent of "back-up cameras" however.

[captaindiego]

Be careful with this, you can start a fire with fresnel lenses at the right angle in direct sun...