Profile-node-examples.md

+# Keyboard key
+
+![](https://user-images.githubusercontent.com/284644/66857647-24578780-efa1-11e9-8986-1229fab5b4c8.png)
+
+```
+default height = 1.0
+default width = 4.0
+default depress = 0.1
+default top_coeff = 0.9
+
+let depression = {height * depress}
+let top_width = {width * top_coeff}
+let depress_r = {(4*depression**2 + top_width**2)/(8*depression)}
+let dx = {(width - top_width)/2.0}
+
+M {-width/2.0},0
+l dx, height
+a depress_r, depress_r 0 0 1
+  top_width,0
+l dx, -height
+```
+
+https://gist.github.com/portnov/3f98a018c5391304fca46457932fcdeb
+
 # Petal
 
 ![](https://user-images.githubusercontent.com/284644/66411840-d6c1a480-ea0d-11e9-8e82-0e3268ac57e1.png)