The channel name and logo reference the color of Grant's right eye, which has blue-brown sectoral heterochromia.[1] It also symbolizes the channel's visual approach to math.[2]
3Blue1Brown is a math YouTube channel created and run by Grant Sanderson.[6] The channel focuses on teaching higher mathematics from a visual perspective, and on the process of discovery and inquiry-based learning in mathematics, which Sanderson calls "inventing math".[7]