Halfway 2014 we designed a Christmas tree shaped as an upward spiral (http://www.elektor-labs.com/project/130478-xmas-tree-2014.14097.html). The extreme high production costs (0.2 mm PCB) was the reason we didn’t make it available in our store. A variation on the original design is making use of circular PCBs with decreasing diameters placed above each other.
9150804590