Breaking the sound barrier does not actually look like this, but its reasonably close. Dedicated to my colleagues who teach Physics.
The wallpaper version is at the preceding link.
Today's Gratitude Item: My local library waiving the usual $1.00 reserve fee on a book that I ordered. They have this promotion where you can order / reserve books for free as long as they are picked up before the 1st of March. To top it off, the book that I got, "Wow!" (Adobe Illustrator CS2) is extremely good. I'm learning a lot from it. There's a version of book out for later versions of Illustrator, but this is the one the library had.