As we know , there are many ways to start a fire! A shoe string can be made into a "BOW" vs "Hand Twisting" , a piece of "ICE" can be made into "LENS" ! Consider this:A piece of discarded trash , a clear glass bottle or even a broken bottle as long as the bottom isn't broken ! 1-Gather fuel for starter , twigs , kindling , etc. ! 2-Shove three sticks with little branches into the ground ,(TRI-POD), to rest the bottom of glass.By observation , one will notice it's a magnifying glass.The trick is to adjust twigs just so to get the best sun-light beam through lens. 3-Best beam established , you then lay your fuel(wood , twigs , etc.) under the beam ! 4-Time passes while you relax and do nothing and you will notice the starter fuel begins to smoke an ember! 5-blow the "Ember" into flame and have enough fuel to keep a fire .! HOPE THIS HELPS..!