What is never the same twice and always beautiful? The waves in a swimming pool of course.
To shoot nearly straight down, I held the camera out in front of me and used the 70D's Vari-Angle LCD to see what I was shooting. Dual Pixel CMOS AF took care of focusing, though the refracted light hitting the bottom of the pool is not sharp anyway.
Camera and Lens Settings
24mm f/8.0 1/1000s
5472 x 3648px