Impressed by ancient Egyptian hieroglyphs, Haring adopted their form of communication by developing characters that were reduced to just a few lines. "There is within all forms a basic structure, an indication of the entire object with a minimum of lines, that becomes a symbol," he said in 1978.

Haring was nothing if not a contemporary artist responding to the pressing issues of the day. With this untitled vinyl painting on tarp, Haring reacted to John Lennon's murder on December 8, 1980. "I woke up the next morning with this image in my head — of the man with a hole in his stomach — and I always associated that image with the death of John Lennon."

Although inspired by graffiti artists, Haring did not consider himself one of them. As his work progressed, he created a signature tag: starting with the outline of an animal, the tag began to resemble a dog; later in his work, it rather appeared as a person crawling on all fours.

Numerous symbols and figures appear repeatedly throughout Haring's work. A simple red heart, signifying love is shown here as a gamble two people take. On the right half of the image is the artist's unique Andy Mouse, a character derived from the Disney figure but tweaked in homage to pop artist Andy Warhol. Context varies, but Andy Mouse is seen as a critique of mass consumerism and pop culture.

Haring was a contemporary of Neil Postman, famous for his book "Amusing Ourselves to Death"; both were ahead of their time as critics of the role of TV and computers in our lives. The screen-headed caterpillar shown in this painting from 1983 combines common symbols in Haring's work to delivers his message of warning that machines pose acute danger to people and could spell the end of humanity.

Adept at critiquing modern culture through symbols he employed, Haring often showed the cross as a place of death or being used by people to commit murder. The cross seen here can be said to represent evangelical Christianity and the trend toward televangelism that swept the US in the early 1980s. In interviews, the artist warned of the danger of dogmatism and "control religions."

Whether you want to interpret the x as the marker of a target or as another letter in the alphabet so frequently used by Haring in his work (and which the exhibition at the Albertina in Vienna is named after), the symbol appears again and again. In this instance, it appears to represent the mob mentality that tears people apart.

Although he died of AIDS at 31, Haring was famous for his politically-driven work even in Europe. He was asked to draw a mural on the Berlin Wall in the late 80s, and painted public service messages, including "Crack is Whack." The turbulence of the 1980s, a decade characterized in the US by the discovery of HIV, military action and the rampant greed of Wall Street, are common themes in his art.

Mixing metaphors, this acrylic painting could be considered an ironic take on the tale of the Golden Calf, here featuring a red monkey worshiped by many. Monkeys are depicted throughout Haring's oeuvre, most remarkably in his work supporting the AIDS advocacy organization ACT UP, which evokes the three wise monkeys from the proverb "hear no evil, see no evil, speak no evil."

Early in his career, Haring sought out opportunities to bring his art to a broader audience — and found it on the empty, black-matted billboards of the early 80s New York subways. Graffiti had already inched into every corner of the city, but Haring took a different approach, using chalk instead of marker to create temporary drawings, similar to this later self-portrait.

Haring used a similar technique to the continuous process employed by Picasso, according to the latter's son, Claude. "He just stayed close, ... painting it from top to bottom — bending on his knees, and never once stepping back to see how it looked. Only after he had covered the entire door did he step back, and that's when the door was finished and became a marvelous painting."

The Altes Museum (Old Museum) is the founding building of the famous museum complex on the Spree Island. In 1830 it was the first public museum to be opened in Prussia. It was followed by the Neues Museum, the Alte Nationalgalerie, the Bode-Museum and lastly, in 1930, the Pergamon Museum. Since 1999, the entire complex has been listed as a UNESCO World Heritage Site.  

The Altes Museum (Old Museum) houses statues, weapons, gold and silver jewelry of the Greeks, Etruscans and Romans. It does not only show ancient treasures but with its columns and splendid halls, it is also reminiscent of the epoch. The heart of the building is the rotunda, which is designed according to the model of the ancient Pantheon in Rome.

The five museums were largely destroyed during the Second World War. The Neues Museum, which remained in ruins for a long time, was hit particularly hard. It remained closed to visitors until 2009. It presents exhibits from prehistory and early history as well as the Middle Ages. One exhibit is particularly famous: the bust of the Egyptian Queen Nefertiti.

The Old National Gallery, a replica of a Greek temple, looks particularly sublime. In front is the equestrian statue of the Prussian King Friedrich Wilhelm IV, who made the first sketches for the building's design. The museum shows paintings and sculptures from Goethe's time of Weimar Classicism to realism. The masterpieces include works by Caspar David Friedrich, Claude Monet and Auguste Renoir.

The neo-baroque Bode Museum, which rises like a moated castle on the tip of the Museum Island, is frequently photographed. It houses, among other things, Byzantine art, sculptures and paintings from the 13th to 18th centuries as well as a coin collection. All the artistic styles of a given period are displayed here together. The museum thus follows the concept of its founder, Wilhelm von Bode.

Since 2014, the Pergamon Hall with its famous antique frieze has no longer been open to the public. The most famous museum on the island is being completely renovated. The construction work should be finished by 2025 at the latest.

Despite the ongoing restoration, visitors can still see the blue Ishtar Gate (above), a Processional Way from Babylon, and the famous market gate of Miletus. They are among the highlights along with the Pergamon Altar. The Pergamon Museum was the last of the five exhibition houses to be built. Its impressive exhibits make it the most visited museum in Berlin.

Nevertheless, visitors to Berlin do not have to forgo seeing the famous Pergamon Altar. Since November 2018, the artist Yadegar Asisi has been presenting a huge panorama picture in a temporary exhibition building opposite the Bode Museum that stages the city of Pergamon with its altar in Roman times around 129 AD.

The newest building on Museum Island is the James Simon Gallery by star architect David Chipperfield, which opened on July 12, 2019. It is the central reception and service building for all five exhibition halls. With around 2.5 million visitors annually, Berlin's Museum Island is one of the biggest crowd-pullers in Germany.

The James Simon Gallery was built as part of a master plan to renovate and modernize the Museum Island. With the new central visitor center and the Archaeological Promenade, the individual museums are to grow together to form a common complex.

Today the collections unite 6,000 years of human history. This earned Berlin's Museum Island the status of a UNESCO World Heritage Site in 1999. With 2.3 million visitors annually, the Museum Island is a tourist highlight in Berlin. A stroll across the Museum Island is definitely worthwhile — even before the reopening of the Pergamon Museum in 2025.