Math Photo: Orthogonal Trajectories

This lovely photo was taken by mathematician Peter Krautzberger.  Peter knows that I enjoy photographing mathematics, so he shared this great image with me.  And he graciously let me share it here, and approved of the title.

I often admire crossing contrails high above in the sky, but I can’t say I’ve ever seen two so perpendicular!

Peter is a friend and colleague from MathBlogging.org, where he is a co-founder.  Peter also works on MathJax, and is consumed by publishing math on the web.  You can follow him on Twitter at @pkrautz.  Thank you, Peter, for sharing!