Buoyancy
Some objects float while others sink in a tank of water.
Coastal Erosion
One tide strips away the exposed outer layer of a sandy shore.
Domino Line
One push travels along a spaced line of dominoes until a gap breaks the chain.
Firebreak
Fire races through connected vegetation but cannot cross water or bare ground.
Gear Train
Turning one gear drives every touching gear in the opposite direction.
Magnetic Field
Metal beads snap toward a magnet when they share a clear line of sight.
Rain Basin
Rainwater gathers in low places until it reaches the lowest spillway.
Rockfall
Loose stones tumble until something solid supports them.
Sunshadow
Low sunlight casts long shadows from objects standing on the ground.
Watershed
Mountain ridges send raindrops toward different colored drainage outlets.
Windblown
A steady gust sweeps loose leaves across a landscape of walls.
Snowmelt
Return to Earth.
Prime
Always start indexing at 0 (but maybe not in this case).
Differences
"Think different." -Apple
Summation
"Everything that can be counted does not necessarily count; everything that counts cannot necessarily be counted." - Albert Einstein
Pivots
"If you change the way you look at things, the things you look at change." - Wayne Dyer
Mirrors
"For the past 33 years, I have looked in the mirror every morning and asked myself: 'If today were the last day of my life, would I want to do what I am about to do today?' And whenever the answer has been 'No' for too many days in a row, I know I need to change something." - Steve Jobs