These photos represent three different forms of art.  The first photo shows that art can be on any type of canvas.  Musicians use instruments to express the artistic musical gifts they have. This guitar produces a beautiful music when played by a competent musician, but it's also beautiful to look at because someone has crafted into a visual work of art.  In the second photo, typography has created a human face. The artist used typefaces, point size, line length, leading (line spacing) and letter spacing to make an interesting work of art.  The third photo looks like an antique sewing machine, but it's a cake.  I'm sure a baker made this cake, but this baker is an artist as well.