2390: Printdoor

Having recently been painting a logo on a steel roller blind, today’s invention is particularly appealing.

It is a simple gantry system that moves a lump of chalk backwards and forwards, as the door closes, so as to create dots whose locations can be computer controlled. This draws a detailed but temporary image on the door surface, just like a computer printer.

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As the door is opened, this film of dusty dots can all be brushed off, ready for the next cycle.

In this way, ever-changing adverts, logos, -tweets even, can appear on otherwise bland industrial units…at least when the weather is dry.

(Image copyright Danny Gilbert)