In this project, someone created a shirt with flashing LED lights in an attempt to replicate the wall in the TV series, Stranger Things, where Joyce communicated with her son, Will Byers.  The lights are programmed to spell out a specific word/phrase that you set.  The shirt is designed with 26 LED lights laid out in three rows with each one corresponding to a letter in the alphabet.  In order to get it to work, they needed to solder the data lines and the power lines (below is the picture of how to solder the lines correctly).  They also had to sow the LED lights onto the shirt and the Arduino on the inside of the shirt so it doesn’t bother the person wearing the shirt.