Today rainbows have also taken on meanings that go beyond religion and legends, touching on politics, society, and human values. The rainbow is the icon of LGBTQ+ community rights; it is the symbol that often appeared on walls and windows during the 2020 health emergency to give strength to people and healthcare workers. It is a wish for peace, tolerance, and mutual respect. It no longer represents only a bridge between the earthly and the otherworldly, but also a pier between different cultures and identities. It is a ladder that creates bonds, reconnecting with others. In this article, you’ll meet artists who captured the nuances of this natural phenomenon, painting rainbows that create authentic connections between humans, nature, minds, and ideals.
Paint with All the Colors of the Rainbow
Show a picture of what color you want, and our machine will create it for you from the five fundamental pigments!
At our dorm in East Campus, making murals has been a long-standing tradition. We love to paint and express ourselves in artistic ways. But as MIT students, we’re also short on time! We find the most time consuming part of painting is mixing the right colors we want to paint with. And we don’t have infinite money that we can buy whatever shade we like! So, we built a device that makes it easier for artists to put paint on paper by taking away the frustrating time it takes to mix the colors we want to paint.
What it does
Our device takes input from the user (you!) in the form of a photo pixel or in the form of RGB value. It then determines the correct proportion of the five fundamental pigments (red, yellow, blue, black, and white) to mix in order to achieve that desired color, and automatically dispenses them for you. This way, your painting time will go down dramatically and you’ll be able to become a more prolific artist 🙂
We first designed our system in SolidWorks. After getting the dimensions and theory of mechanics right, we constructed using 80/20 and laser cut clear acrylic. We have the five base pigments arranged in a circular array of syringes, and we use Nema 17 stepper motors to rotate the array and to dispense the correct amount of each base pigment into a bowl. We use Pololu motor controllers driven by an Arduino Mega 2560. To determine the correct mapping of RGB value to proportions of RYBWB pigments, we use a machine learning algorithm generated by data we gathered at the beginning of the hackathon (what proportions of RYBWB pigments lead to what RGB values). Our classifier does a decent job of determining the correct proportion, and our mechanical system can accurately dispense the desired amounts of each pigment.
Challenges we ran into
We faced some problems in counteracting inertia when rotating the array of pigments. We were able to fix this problem by reducing the mass of our array and implementing a ramp-up rotation algorithm. Developing our function mapping algorithm also proved challenging, though we were able to figure out a solution 🙂
We’re so happy that we made a funcitonal, sophisticated, and aesthetically pleasing device. And proud of dealing with the challenges written above.
The Biblical Promise
In the beginning, there was a thunderstorm and a divine rainbow. We are not talking about an ordinary thunderstorm, but about the universal flood narrated in the Bible. The book of Genesis tells of a terrible flood that struck the earth, as a divine punishment for being disappointed by human beings: they were not the virtuous creatures he had imagined. Noah, the patriarch known for his righteousness, then built a Great Ark to save the human species and other living beings. What struck the imagination of artists was not only this terrible episode of rain . but also the rainbow that followed.
In this case, the rainbow becomes the symbol of a new alliance and rebirth; the pact between humans and gods that sanctioned that from that moment all would be well and good. God, by sending the rainbow, established that ‘neither shall all flesh be cut off any more by the waters of a flood; neither shall there any more be a flood to destroy the Earth’, also restoring reciprocal trust.
The rainbow as a symbol of promise was not only depicted anciently in the Bible but also struck a chord with more contemporary artists such as Marc Chagall. The painter of Belarusian origin naturalized French painted in the mid-20th century a long series of paintings dedicated to the biblical theme of Noah, representing visionary rainbows of very different styles and shapes.
Painters who Capture Rainbow Lights
However, the rainbow did not only attract artists for its mystical and divine properties. The fact that it was such a fleeting optical phenomenon seduced landscape painters whose greatest challenge was to capture light and its variations on canvas. Guided by optical theory to be applied in the use of pigment, not only the Impressionists but also painters such as William Turner, John Constable, and Georges Seurat sought to depict the rainbow. Turner, whose artistic research often focused on weather phenomena painted it for what it was: a transient explosion of light and color. The same interest is present in the painting of the post-Impressionist painter Georges Seurat, that using dazzling and pointillist touches of colors to seize the moment.
John Constable, the professional artist Master of Landscape painting who focused on bucolic and rustic settings, caught the phenomenon of the rainbow in its double mysteriousness. He painted through oil paint a double rainbow: one more pronounced, the second as its fainting shadow. He skillfully shows the ephemeral nature of this effect, while capturing it forever on the canvas.
Rainbow Light Installation
The rainbow fascinates for its variety of colors -sea blue, dark green, but also blood red-. Despite the scientific explanation, this optical phenomenon continued to arouse curiosity and inspire artists beyond the 19th century. Its implications related to the different perceptions of lights offered a perfect field of research for contemporary art. Several artists explored the topic of the rainbow abandoning painting and preferring the involving medium of Installation Art. They produced site-specific installations, sometimes collaborative and participatory, experimenting with colors and viewers’ visions. An example is a mesmerizing rainbow created by the Mexican artist Gabriel Dawe at the Toledo Museum of Art, an explosion of colors that transformed the exhibition hall in an experiment. German artist Markus Linnenbrink also uses the colors of the rainbow to create an installation at Kunsthalle Nuernberg: a room rendered disorienting by colors, a polychromatic labyrinth. And what about the radiant light ring by environmental art master Olafur Eliasson? In 2011, the Icelandic-Danish artist installed a glass gallery with 7 rainbow colors on the roof of the Art Museum in Aarhus, Denmark. It is an iridescent, walkable color circle, made ad hoc to give visitors new filters (and visions!) on the city: your rainbow panorama.
However, the rainbow has also taken on meanings in the art that go beyond its chromatic and optical illusion aspects. Rainbow art in the 70s was used to express pride and support for marginalized communities and identities. In the 1970s, artist and drag queen Gilbert Baker used the rainbow for the first time to represent the LGBTQ+ community. The seven colors have thus become an international symbol of sexual and gender variety and heterogeneity. The different colored stripes represented respectively life, healing, sunlight, nature, art, serenity and spirit, and a demand for respect and equal rights.
This international symbol also has been used by artists to represent the fights for the rights of the LGBTQ+ community, the pride of queerness, but also other struggles such as those related to the AIDS crisis of the 1990s. The artist Derek Jarman used the rainbow palette in his gestural painting to exhibit the violence of AIDS disease, a plague that also killed him in 1994. In Jarman’s artwork, Ataxia-Aids is Fun, the colors create a confused, hyper-saturated, unstable composition; an effect similar to that of ataxia, a nervous system deterioration that causes terrible loss of balance. Jarman uses rainbow colors to convey with dark humor an important message about the homophobic stigma related to AIDS.
A Message of Hope
We live in dark and confusing times. In this complexity, the symbol of the rainbow has often taken on meanings of hope and solidarity. Just think of the rainbows drawn by children during the Covid emergency, a community encouragement from public places and private windows. The rainbow represented a metaphorical bridge, capable of linking people in a moment of physical distance and no contact.
But that is not all: artists also used the rainbow symbol and its transparency as a signal to counter the horrors of war. The English Pre-Raphaelite painter Evelyn De Morgan in her SOS sublimated the violence of World War I by painting a rainbow that reconciles good and evil. The solitary female figure dressed in white symbolizes the victims of war, waiting for salvation.
In art, therefore, the rainbow is a symbol of hope, capable not only of enlightening but also of leading towards more peaceful and fair direction. An equally curious representation of the phenomenon appears in a book of emblems of the 1610, that represents a cloud laden with rain and surmounted by a rainbow. The image has been selected by the artist Henry Pecham to bears a motto in Latin: cum severitate lenitas. Even in harshness, there is mercy. Rainbow embodies this naïve and stubborn hope: where there are edges and obstacles, somewhere you can also find lightness.
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Cinzia Franceschini is an Italian Art Historian specialized in History of Art Criticism, with a second degree in Communication and Sociology. She studied in Padua, Brussels, Turin and wherever you can go with the power of the Internet. She works as guide in Museum Education Departments and as a freelance writer. She writes about Contemporary Arts and Social Sciences, mostly about them at the same time, in an inclusive, feminist, transnational perspective.
