Optical challenges, hands-on puzzles and an invitation to look at the world through three-dimensional glasses are among the highlights of a visit to Frankfurt’s Explora Museum.

Located in a former several-story-high World War II bunker in a quiet residential neighborhood, the museum is a showcase of optical illusions, holograms and exhibits aimed at awakening an interest in more than one level of the viewing experience. Upon entry visitors are provided with their very own pair of green-and-red tinted glasses through which they are invited to peruse the many images which have been created to portray more than a simple two-dimensional universe.

Drawings of artist Christo Javacheff’s “wrapped Berlin Reichstag” take on depth as one dons the glasses and moves around the flat surface. It’s as if one could reach into the artist’s work and rearrange the objects and people within. One experiences the same sensation in a poster for the film “Tomb Raider” which is displayed next to a print of Leonardo da Vinci’s “Vitruvian Man” that obviously served as its inspiration.

Many of the images are familiar — M.C. Escher drawings, Dali and Picasso paintings — but it is a treat to become reacquainted with them among the many eye-opening optical puzzlers.

The museum building, which once served as protection for Frankfurters in the neighborhood from Allied bombs, was built in 1938 and features two-meter-thick outside walls.

Even before entering the exhibition, one is provided with an obvious clue that humor plays a hefty role in the exhibition. A giant bust of Vladimir Ilyich Ulyanov Lenin adorned in a hefty pair of three-D goggles welcomes newcomers to the facility. Once inside visitors are directed up the stairs to wander through the gallery. Because of the dense outer walls and dimly lit interior in some rooms, one has the impression that empty frames await viewing in some rooms. But closer inspection reveals a world populated by the holographic likes of a very real-looking, three-dimensional Dracula, baskets of eggs, cubes and other animate and inanimate objects.

Besides the many puzzlers — drawings which reveal an entirely different image when viewed from a different angle or perspective — are stereoscopic pictures and Single Image Random Dot Stereograms. While most of the optical teasers reveal a second level fairly quickly, the SIRDS take a serious dose of patience.

Young people may enjoy the hands-on puzzles as much as the visuals. Besides solving T-form and tower puzzles, younger visitors are welcome to make music with cowbells, a steel drum, piano and other instruments.

Museum curator Gerhard Stief first began displaying his collection in the town of Dinkelsbuhl at a sister museum. In 1994 he opened in Frankfurt-Rödelheim, before acquiring the former bunker and opening at the present site a year later.

One of the most intriguing holograms titled “Shower Lady” features an almost cinematic quality viewing experience. As one moves from left to right the three-dimensional woman depicted in the shower seems to become aware of the viewer and takes steps to protect herself from prying eyes. One is rewarded with a wink from the modest maiden as one reaches the far right side of the image.

The Explora is not the largest museum in the world, but because many of the displays require patient viewing, one finds the time passing quickly. A cafe in the museum features refreshments for those needing a break.

The Explora Museum is located at Glauburg Platz in the Nordend section of Frankfurt. To get there by public transportation take the U-5 tram to Glauburgstrasse and walk about 300 meters on that street before turning left onto Lortzingstrasse.

The Explora is open Tuesday through Sunday from 11 a.m. to 6 p.m. Admission is !8 for adults and T5 for children. For more information visit the www.exploramuseum.de website or call civ (069) 788 888.

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