Logos surround us everyday, but we rarely examine the thought and artistic thinking that goes into the design of these symbols.

As part of its Off Book documentary series, PBS takes a look at logo design—from its beginning of cave painting, to the complex visual designs of today—and interviews designers (Stephen Heller, Sagi Haviv, Kelli Anderson and Gerard Huerta) to break down the thought processes that go behind some of the world’s most iconic logos.

[This was an excerpt from TAXI]