Thanks ! , Heat equation is a partial differential equation that tells how temperature spreads over a region as time progresses, The "temperature" here being p

Thanks ! , Heat equation is a partial differential equation that tells how temperature spreads over a region as time progresses, The "temperature" here being proportional to the redness. If you switch to the wave equation it's like a waves on a surface of water , the redder regions being more up and the bluer regions being more down