My design involves an origami cube which is called a Columbus Cube which has one corner which is indented in a triangular shape and another smaller piece which is in the triangular shape that fits in to that corner. The triangular piece has a magnet in it which triggers a Reed switch located in the main cube. The original state of the cube is to have one blue LED shining (LED1) on the top of the cube. Once the triangular piece is placed into the recess it triggers the blue LED to turn off and a row of orange LEDs on the left side of the cube and red LEDs on the left side to turn on. In this way the concept of something fitting together and triggering a change is shown. Once the piece is removed and then placed back in the indentation, the blue LED switches back on and the orange and red ones turn back off showing the concept of the reverse method where two subtrates bind to make one product. 

The first obstacle I came up against was that in real ife the substrate is free-moving and the enzyme remains fixed. But when I was figuring out the circuits I realized that I would have to reverse this as I was using the LEDs to show the change being triggered in the substrate which would mean all the electrical components would have to be in the substrate piece and therefore it would need to be fixed while the so-called enzyme piece could be free-moving. The first idea I came up with involved a vibrating motor as well as LEDs which would vibrate when the substrate was on the enzyme but my code would not work so I decided to move on. I then thought about introducing a capacitive sensor made from conductive paint that would trigger LED1 when the substrate was close to the enzyme. So, LED1 would only turn on when the substrate was near and then once it was placed on it LED1 would turn off and the other LEDs would turn on like in the final idea. I got my capsensor to work but it was interfering with the other LEDs and wasn't quite working right so I had to get rid of that as well. 

The concept of lock and key interested me. The idea of a site that was specific to another piece that triggers a change when they are brought together was what drove me forward. I thought showing a change being triggered in this way was ideal through LEDs for a one week project. In this way I mapped my interaction and concept ideas as shown below.

The circuit has LED1 which is the LED (blue in the finished one) that is the only one on at first and it is at the top of the cube. When the magnet triggers the Reed switch it will turn on the row of orange LEDS that are on one side of the cube and the red ones on the other side of the cube. The picture below shows the circuit before the final LED colours were decided and the rows of LED were put in at the base of the cube - there are only test LEDS pictured. 

Finished Circuit Below

This first video is a circuit test I did and it shows the circuit when it was working. You can see that the green LED on the white clips is lit at first and when the switch is activated the LEDs on the paper circuit turn on and the first LED turns off. This is what my final form was doing before it got jostled and fell on the bus. 

This next video is the final form after it was jostled and so the red and orange LEDs don't turn off when the blue one is on and so they are always on. So you can still see the change being triggered because the blue LED turns on and off and so changes the overall colour when the magnet triggers the LEDs.