Today her finger nail is a means of expression, decoration, drawing attention.

Finger nail decoration machines already exist to allow a customer to choose a design, then automatically decorate and dry those nails. Embedding digital information on those nails would be a relatively trivial step (though generating a critical mass of device to read what is on the nails is non-trivial). If you could store and communicate information through your finger nails what would you want to store and what would you want communicate? Is one kind of infomration more suited to thumbs or particular fingers than others? The number of digits is one natural parameter, combined with issues such as biting nails, locations where finger tips can and will end up, and how long users would expect a finger nail design to last before being refurbished offer interesting user interface possibilities and forms of interaction.

The broader issue is – what is possible without going down the routes of embedding technology under the skin, personal area networks or alternatives like bone induction?