Hi Denis -
For lack of anyone else weighing in, I'll say this ...
To my knowledge there are no tech issues to large numbers of columns or odd
numbers.
The page weight increases (larger CSS) as you add columns because there are
6 or so new style rules for each added column.
Maintainability gets more difficult in a team environment as it's harder to
figure out what you did and why. If you are after a certain
pixel-perfect alignment, it may be more advantageous to simply plug in the
sizes you want and forget about grid abstractions.
From a design prespective, you begin to lose elegance when the columns are
not easily divisible into thirds, fourths, sixths and eighths.
That's the magic of 24 - it easily accomodates those splits and splits of
those splits.
If you have a design reason to go odd, go odd. Look at Eric Meyer's complex
spiral project all based on the rule of thirds - that would take
you to unusual column sizes if followed recursively for several splits with
mathematical precision.
Grids are the online equivalent of graph paper - pick a size that seems to
support your design intentions and run with it. You can always
resize the grid - look at the Compass project to see blueprint grids resized
on the fly.
Gutters can be any size as well - just like margins. If they get too small,
the page becomes harder to read due to lack of whitespace / separation of
text from nearby edges, but the judge of that is you, the designer. If you
are prepending or appending to make larger effective gutters, then gutter
size becomes less significant as the total whitespace is what's visually
important. Only you know where the grid and gutter lines are. There are no
right or wrong answers.
Duke
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