On Instagram, Lindsey Shaw Bardsley has a ‘sand diary’ and posts many lovely pictures and video clips.

“My sand diary.  Sand fanatic and observer of patterns, weather, dunes, tides. Surfcaster. Photographer of micro-landscapes.” See here on Instagram

Lindsey lives in Gloucester, MA, USA, which has extensive, amazing looking, intertidal areas and coastline. See Google map here.

Posts include video clips of tides coming in, and pools of water disappearing into quicksand, e.g. here

Thanks to Heather Green for the links.