Last weekend, the National Building Museum in Washington, D.C., opened a 10,000 square-foot ball pit to the general public, and everyone cheered that, finally, someone made their childhood dreams come true.

The 150-square-metre Villa Ypsilon was designed by London- and Brussels-based firm LASSA, which is headed up by architects Theo Sarantoglou Lalis and Dora Sweijd.

Actress Emma Watson attends the World Premiere of Harry Potter and The Deathly Hallows – Part 2 at Trafalgar Square on July 7, 2011 in London, England. (Photo by Ian Gavan/Getty Images)

Actress Anne Hathaway attends the “The Dark Knight Rises” World Premiere at AMC Lincoln Square Theater on July 16, 2012 in New York City. (Photo by Jim Spellman)

Rowan Atkinson attends the UK premiere of Johnny English Reborn at The Empire Leicester Square on October 2, 2011 in London, United Kingdom. (Photo by Dave Hogan/Getty Images)

If you ever wanted to meet a live Pikachu, you might have a hard time finding one. However, there is a creature on this Earth that kind of looks like one. That creature’s name is Thecacera pacifica and it is a species of a sea slug. These little critters can be found in the Indian Ocean from African coast to Indonesia and Vanuatu. Their vibrant orange and blue colors look gorgeous, making it look like some sort of anemone. Also, as you might have guessed from the striking colors of the sea slug, just like most of anemones, this creature is very toxic. Thus, keeping it as a pet isn’t an option.

In this Friday, December 5, 2014 photo, Iranian volunteer Asal Moghaddam plays with dogs at the Vafa Animal Shelter in the city of Hashtgerd 43 miles (73 kilometers) west of the capital Tehran, Iran. More than 500 dogs find care and affection at the Vafa Animal Shelter, which was established through an endowment in 2004 and is the country’s only licensed animal refuge. (Photo by Vahid Salemi/AP Photo)

A worker carries a tray of boiled tofu in a traditional tofu factory in Depok, Indonesia, 21 January 2015. Tofu has been a common side dish for many Indonesian families. It is healthy, inexpensive and easy to find throughout the city. Tofu entrepreneurs in Indonesia are suffering due to the weakening of the rupiah against the US dollar and the rise in prices of imported soybeans in the international market, forcing tofu-makers to cut their production and lay off staff. (Photo by Adi Weda/EPA)