A codex (Latin caudex or "trunk of a tree" or block of wood, book; plural codices) is a book in the format used for modern books, with multiple quires or gatherings (sheets of paperor vellum in multiples of two which are folded and stitched through) typically bound together and given a cover.

Developed by the Romans from wooden writing tablets, its gradual replacement of the scroll, the dominant form of book in the ancient world, has been termed the most important advance in the history of the book prior to the invention ofprinting.

The Codex Leicester (also briefly known as Codex Hammer) is a collection of largely scientific writings by Leonardo da Vinci.

The codex is named after Thomas Coke, later created Earl of Leicester, who purchased it in 1717. Of Leonardo's 30 scientific journals, the Codex may be the most famous of all.

The Codex provides an insight into the inquiring mind of the definitive Renaissance artist, scientist and thinker as well as an exceptional illustration of the link between art and science and the creativity of the scientific process.

CodexLiam.com pays homage to the original codices and the transition from scrolls to wooden books in the first century. Three thousand years later, in the third millenium, we have again made a transition and todays CodexLiam is a compilation of all media types, video, text, pictures, photos, software, communication and more detailing the thinking and work of Liam.