The Michaelangelo of Microsoft Excel

When Tatsuo Horiuchi retired, he decided to try his hand at art. But instead of spending money on paints and brushes, Horiuchi used what he already had pre-installed on his computer—Microsoft Excel. Now, the 77-year-old artist is creating remarkably intricate digital masterpieces of the Japanese landscape, all on the free graphing software. (Source)

I have seen some works made using Microsoft Excel for example by coloring cells, but Mr. Horiuchi uses like line tools and bucket tools. The results are amazing.