Make your own cheap Parabolic Mirrors

Stumbled on this on hack a day,  The first mirror is easier to make, but …it depends on air pressure (lack off) to keep its shape and could leak out.  The second one is a bit more involved in building, but seems more robust.  Using the space blankets are pretty cheap (I have seen them at the dollar store).  And to buy a big mirror like this would cost an easy $100, so this is a worthwhile build

Easy Parabolic Mirror from a Trash Can Lid

Pressure-formed Parabolic Mirror from a Mylar Blanket

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