New Logo and Identity for Slack by Pentagram and In-house
Slack logo update that we liked:
Derived from the original logo and built on a grid, the new octothorpe is comprised of two basic geometric shapes—a speech bubble and lozenge—that can be extracted and used as graphic elements. The speech bubble evokes communication and connectivity, and will form the basis of a system of customized icons, illustrations and motifs with rounded corners that echo the shapes of the logo.
Read more here: