This picket fence won't keep any of your neighbors out but it sure works well for measuring the acceleration due to gravity!
Made from 1/8" thick Plexiglass it is 15 1/2" x 2 1/2" with uniform 3/4" black strips. Drop the picket fence thru a light probe and its acceleration from gravity can be easily calculated. This kit also includes a 10 7/8" x 8 1/2" letter "G" made out of stiff cardboard and precisely proportioned. It also provides a method to calculate the acceleration due to gravity by dropping it thru a light probe.