Numberblocks is a British animated series for young children that teaches numbers through characters made from blocks, with One as the very first character in the series. The show began on CBeebies in 2017 and quickly became a staple of early-years learning, which helped its characters travel far beyond television into online videos, classroom clips and fan-made projects. Short voice clips like this one are shared and reused because they are instantly recognisable, easy to place in counting content and carry the show's friendly educational tone without needing any explanation.