This is the Otamatone from Maywa Denki, not to be confused with the Jumbo or the Deluxe versions:
These delightful ‘singing’ creatures/instruments were developed in Japan by the Cube Works Company along with Maywa Denki and Novmichi Tosa, who is demonstrating in these videos. Otamatones are known to be the “world’s cutest and weirdest musical instrument”. This appears to be true.
Otamatones of all sizes and colors can be found on Amazon. This one is a bestseller. Affiliate links included.
• Boomwhacker Bach
• Toy Piano Virtuoso Margaret Leng Tan
• The Giant Anteater – Songs for Unusual Creatures
via io9.
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