Grid: simple data model

[[ "Column 1.1",  "Column 1.2", "Column 1.3", "Column 1.4", "Column 1.5" ], 
 [ "Column 2.1",  "Column 2.2", "Column 2.3", "Column 2.4", "Column 2.5" ], 
 [ "Column 3.1",  "Column 3.2", "Column 3.3", "Column 3.4", "Column 3.5" ], 
 [ "Column 4.1",  "Column 4.2", "Column 4.3", "Column 4.4", "Column 4.5" ], 
 [ "Column 5.1",  "Column 5.2", "Column 5.3", "Column 5.4", "Column 5.5" ], 
 [ "Column 6.1",  "Column 6.2", "Column 6.3", "Column 6.4", "Column 6.5" ], 
 [ "Column 7.1",  "Column 7.2", "Column 7.3", "Column 7.4", "Column 7.5" ]]