Take a figure of a historical patent, meticulously drawn before there was software.

It’s a Plural Grating Spectrograph.

Wonder about the appeal of antique technical drawings.

So modest, so sublime.

Copy it, multiply it.

Slowly rotate the color wheel, until the purples meet the reds again.

This is an impossible spectrum. There are no purples in the rainbow.

But engineering is a creative pursuit. Let the image reflect it!

Transform. Distort. Play! As the inventors have played with designs in their minds.

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Original image: Figure 4 of patent US2453164A – Plural grating spectrograph (US patent images are in the public domain). Also known from :-) the series of diffraction plots.

Status of the Plural Form before distorting it:

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If you enjoy looking at my art: Please consider donating to the Cards for Ukraine project.

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