Here is a library to write GNUPlot output from the Arduino. Now the Arduino can produce a graph output that is directly renderable across multiple platforms and cloud services. Does not rely on some gone tomorrow software + lets you edit the plot afterward.
Draw five dots anywhere on an orange with a white board marker. There is a way to cut the orange exactly in half so that at least four of the dots are visible on one side. Can you figure out how? Solution in this video.
Its kinda captivating, an image that uses only one of every colour possible on your computer. It makes for an odd desktop background on a 4K screen.