1| 3D CLOUD
2| PRESS
3| BEST LINE
FRACTION OF SUM OF SQUARES KEPT (from origin)  
BEST POSSIBLE (from origin)  
center the data
show the drops
show true axes
covariance-PCA (original scales)

STAGE 1

where it lands on the glass
origin (0,0,0)
glass plates
classes
drag the handle to tilt the glass