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Inspired by the TV series Numb3rs, instructables user johnpombrio worked with his son on this glass dry erase board. He writes:

This instructable will show how to build a glass whiteboard that will never wear out and never ghost. The size I made mine was 28 inches by 54 inches and was NOT made to freestand as it would take up too much room in my sons college apartment. Total cost was a very reasonable $60-65, and took a weekend to build and finish (minus the time going to and from stores!). The glass was from a local IKEA store. It is normally used as a desktop protector and is safety glass weighing about 30 pounds . My son is a Math and Com Sci double major along with being a whiteboard nut and his rooms look a lot like the garage in A Beautiful Mind so a great project for him.