Most often seen on Internet pages, it is a kind of text which although not actually present is nonetheless immediately available, usually by clicking on a hyperlink. Its purpose is generally to embellish or add information to the text preceding it. A footnote may also be considered a kind of hypertext. The hypertext is in this sense on a separate spatial plane to the regular text, but somehow on the same temporal plane. The design idea behind hypertext is that it can be read simultaneously with the main body of the text. Jacques Derrida's more creative works, like Glas (1974), play on precisely this problematic.