**On making mistakes and making the same mistake twice.**

**The first photographs** in this post are not mistakes, I now have two refurbished luminaires just lots more to go but at £10+ a pop for the bulbs will be doing it piecemeal. (Pop, bulb, get it?)

**Now to the mistake part**, I have found a relatively cheap supplier of live edge acrylic sheet and have in mind to make a large spherical piece out of laminae separated by gaps. So what we have in the photographs is a maquette of concentric circles each two cms smaller diameter than the one below it and overlapping by one cm the gap between each one being 1 cm, with sufficient gaps to get the radius of the sphere. This repeated 1 cm up and 1 cm in gives a constant angle of 45 degrees, not the formula to get a hemisphere and I should know this having made exactly the same mistake trying to make a sine wave and ending up with a saw tooth

**Tomorrows task** then is to make another maquette where the gaps between laminae are still 1 cm but the diameters of the laminae are set by the width of a hemisphere at the relevant point. I have no doubt that there is a way of calculating this, there must be since it is possible to plot the graph of a circle but I will draw it and measure the drawing. I could of course use concentric circles as above but then I would have to vary the gaps between the laminae and I think this would look strange.

**Learning point**, my late father-in-law was a joiner and used to say measure twice and cut once, in this case by making the test pieces I have wasted some time and two sheets of card rather than twenty quids worth of acrylic.

Nice lampshades though.