Input equipment: how a person answers back

Film or glass sensing a finger through an electric field. High precision, honest multi-touch, and the glass can be thick — touch reads straight through, so the exhibit survives a blow.

A frame around the edge catches the broken beam. It responds to anything — finger, glove, pointer, elbow. In a northern museum in winter that is half the room.

A scanner casts a plane of light above a surface and detects where it is crossed. It turns a wall, a vitrine, a model or a floor into a touch surface — no film, no frame, no intervention in the surface itself.

Glass, touch layer and electronics already built and tested together. A kit of frame, panel and computer is cheaper on paper, takes longer to commission, and when it fails there turns out to be nobody to blame.

Industrial buttons and grips, taken off real machinery or made to match. Understood without a word — by a child, and by the visitor who keeps away from screens.

Turning is the most natural gesture after pressing: it is how you leaf through years, move through a cutaway, change scale. A knob gives what a screen cannot — resistance under the fingers.

A real object with a marker underneath: the system knows what was placed and how it is turned. The interaction becomes physical and collective — everyone holds their own.

A ticket or wristband with a tag. Touch it and the exhibit speaks your language and resumes where you left off. At the end of the route it hands you a personal summary of what you saw and gathered.

Load cells, pressure mats, rotation sensors. Cheap and utterly honest: apply force and something happens. Nothing to explain.

The camera measures distance to every point in frame and builds a skeleton: where the arms are, which way the lean goes, how many people. The basis of everything involving waving, copying and dodging.

The device looks up and sees hands down to individual fingers: a virtual object can be picked up, turned and taken apart by hand. Not one touch — and it looks like magic.

An infrared or radar sensor notices someone nearby. The cheapest part in the whole specification and one of the most useful: the exhibit calls out, and in an empty room it saves its own life.

A light headband reads brain activity and tells states apart — concentration, relaxation, a spike of attention. It does not read thoughts, and saying so plainly on the exhibit is already half the scenario.

An industrial camera and a neural network: tells objects apart, counts people, recognises a gesture or a drawing. One camera replaces a dozen sensors and does what sensors cannot do at all.

Age, gender, emotion, identity — from a face. It works reliably and costs little. We install it rarely and discuss it separately: biometrics are a special category of personal data, and the rules are stricter than they look in a vendor demo.

This only became usable recently: current models understand living speech rather than memorised commands, and answer from the content of the exhibition rather than from a list of ten questions.

A tag on the ticket and receivers around the building: the system knows who is where, to within tens of centimetres. Content arrives by location, and you get a map of the routes people actually walk.

A table with paper and a scanner: colour a sheet, place it under the camera, and ten seconds later your character is swimming among everyone else's. It holds a child without fail, and the sheet goes home.

A laser scanner or photogrammetry turns an object, a room or a site into an accurate model. Modelling a building from scratch costs more and convinces less than scanning it in a day.

A phone already has touch, camera, microphone, sensors, lidar on the higher models, a screen, sound and enough power for augmented reality. Nothing spent on hardware. You pay elsewhere: every step before launch loses people.