also extends to the long cycle of nature and culture. Leading up to the front entrance, visitors are also greeted by perennial gardens that were planted in accordance with the historical classification system designed by Carolus Linnaeus. The front of the entrance is tiled in Penrose tiling. Heureka's planetarium The hemispheric-shaped planetarium primarily presents films dealing with astronomy. Until 2007, the theatre was called the Verne Theatre, and it ran super films and multimedia programmes made with special slide projectors that took advantage of the entire 500 m² surface of the hemispheric screen. At the end of 2007, the theatre was entirely renovated, and reopened on 26 December 2007 as one of Europe's most modern digital planetariums. The digital Sky Skan equipment of the current planetarium allows for projecting moving images to the entire surface of the hemispheric screen and thus creates a strong cinematic experience. The planetarium also has a traditional star sky projector for special programs. There are altogether 135 seats in Heureka's planetarium, and it is often used for planetarium films with an outer space theme. Other daily programmes In addition to the exhibitions and planetarium films, Heureka also offers the opportunity to view daily science theatre shows, to participate in supervised programmes and to watch basketball games played by rats. Furthermore, a number of other individual events, such as Science Days, science holidays and science camps in the summer are organised at Heureka. Public lectures with different themes are also regularly held in Heureka's auditorium. Public lectures are given in the planetarium as well. Other services at Heureka include a science shop and a restaurant, as well as conference facilities and a 220-seat auditorium for meetings. Facts about Heureka Visitors From 1989 to 2011, an average of about 285,000 people have visited Heureka each year. The total number of visitors exceeded six million in May 2010. From spring 1989 to the end of 2020 over 8.9 million people have visited Heureka. Altogether almost 29 million people have viewed Heureka's exhibitions on display both in Finland and abroad. Of the average 285,000 people who visit Heureka each year, more than half represent families, one fourth school students, about 10% are corporate visits, and the rest are individual visitors. About 6-10% of the visitors arrive from abroad, with the highest percentage coming from Russia and Estonia. The number of visitors is affected by, for example, the general economic