Canvas

A Canvas is a thin portable working surface. It can hold a file, display an examination or give two people something to read across a table. Its familiarity makes it easy to forget that what appears on it depends on what it has been allowed to reach.

Some Canvases are connected. Others are deliberately kept offline. A blank forensic Canvas begins without an inherited case history, ready to record a particular examination. None of these arrangements makes the surface a witness to everything that happened before the material reached it.

Identity and access belong to a wider environment. Wearables carry permissions, rooms recognise authorised people and institutions decide what a person may open. A Canvas gives those decisions somewhere to become visible. It does not settle them by knowing its owner perfectly.

For ordinary work, the convenience is considerable. Information can move between a desk, a wall and a portable surface without anyone needing to think very hard about the connections.

An investigator may have reasons to think harder.

Connecting a file to a larger system can invite checks, record an action or bring somebody else's rules into the room. Keeping it isolated can preserve control over who sees it, while leaving important questions unanswered.

A cable in sight cannot prove that a record is true. It can make one connection possible to account for.

The choice is rarely between trusting technology and refusing it. More often, it is a decision about which machine may see which part of a life, for what purpose, and who will have to explain that decision afterwards.

The surface itself offers no objection.