SubSquare is a person who has been creating infographics, articles, and threads for the Polkadot community for the last two years. They have shared some of their work with the Kusama community. The work includes articles, Twitter threads, and YouTube channels that explain various aspects of the Polkadot ecosystem in simple language. Some of the topics covered are the Polkadot timeline, tools, network tab, account section, common good parachains, and multisig wallet. SubSquare has also written an article about Jur Network, which is powered by Web3 and owned by citizens. The work is aimed at helping people understand the Polkadot ecosystem better.