Making the Internet of Towels (IoT) with Lenticular Images & QR codes

(Left image) Internet of Towels when viewed head-on/flat; (Right image) Internet of Towels when viewed at a 45-degree angle.

Technique#1: Lenticular Images

Lenticular images in postcards (Image source: https://www.pinterest.se/pin/524739794086960096/)
(Left) How autostereoscopic lenticular displays work (image source: https://en.wikipedia.org/wiki/File:Parallax_barrier_vs_lenticular_screen.svg); (middle) Lenticular barrier technique with paper folding (image source: http://www.kulzerdesign.com/main/art/web/atwater/4/lenticular.html) (right) Shadow/illusion knitting (image source: https://www.oozandoz.com/reflections/optical-illusion-fashion-shadow-knitting/)

Technique#2: QR Codes

An example of contemporary uses of QR codes for COVID-19 vaccine passports (image source: https://www.vox.com/recode/22384340/vaccine-passport-vaccine-record-covid-19-clear-commonpass-excelsior-pass)
The screenshot is taken from the peer-reviewed article “Fast-Component Based QR-Code Detection in Arbitrarily Acquired Images” by Belussi & Hirata (2013) (https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.884.8282&rep=rep1&type=pdf)

Combining the two techniques

Lenticular crochet

In my first trials with shadow crochet, I tinkered with the height of the lifted blue stitches for each row.

Data Matrix

Experiments with a 10x10 data matrix — the stitches were misaligned, it did not work great!

QR code

I used Microsoft Excel to make the lenticular yarn pattern for the 25x25 QR code. Two cells/stitches = one pixel of the QR code.

Make a lenticular towel pattern for your custom QR code using the Yarn Arts Software

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Reference books and articles

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Researcher, designer, crafter of things

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Anuradha Reddy

Anuradha Reddy

Researcher, designer, crafter of things

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