A red/yellow label with an invisible barcode is scanned with a Motorola LS2208 scanner. Initially, a polarizer is placed on the label to make the barcode visible. It is seen as faint vertical lines.

The polarizer is then removed and the barcode becomes invisible to the observer. The scanner is activated repeatedly and the invisible information "3456" is displayed as a new entry in the spreadsheet.

An invisible barcode label is laminated on top of a magazine cover. The underlying printed material can be read through the label. The barcode is visible to the naked eye by placing a polarizer on top. However, this blocks acquisition of the data.

When the polarizer is removed, the barcode becomes invisible to the observer/camera. The scanner, however, can read the barcode. The video demonstrates 12 acquisitions of the barcode data as signaled each time by a 'beep' and a green LED turning ON.

A small strip of polarizer sheet was attached to the front of the iPhone’s camera and its flashlight. At first, a polarizer (validator) is placed above a blank label to reveal a hidden QR-code to the viewer.

A barcode application (I-nigma) turns ON the flashlight and displays a high contrast QR-code image. The validator is then removed and the QR-code remains visible only on the iPhone screen. The camera focuses on the image and the reader acquires the data successively (indicated by a bell sound). The barcode's data redirects the browser to Opthentic's (old) internet site.

Initially, the invisible QR code is made visible to the observer (or camera) by overlaying a sheet polarizer.

The polarizer is removed and the label appears to the eye as a green reflecting blank (overexposure makes it appear white).

The smartphone (having a small polarizer strip over the camera aperture) "sees" a black QR image on a green background, acquires the data and redirects the browser to Opthentic's (old) internet site.

The label initially appears as a green blank. Overlaying a linear polarizer reveals hidden images.

Rotating the polarizer changes the contrast continuously. The central image is designed to "rotate" with the polarizer.

The label appears as a green blank. Overlaying a linear polarizer reveals a 3D image.

Rotating the polarizer creates different shading of the various surfaces.

The initial image consists of a hologram-like substrate without any image. Overlaying a linear polarizer reveals a horse image whose color changes with the rotation of the polarizer.

Two concentric images are revealed when a polarizer overlays the blank label. The images are designed to give the illusion of rotation when the polarizer is rotated. One ring rotates with the polarizer while the other rotates in the opposite sense.

There are designs where the images rotate at different "speeds" than the polarizer.

A red reflecting blank label. A hidden image is revealed by placing a linear polarizer over the label.