Introduced the Perspective Grid tool and variable-width strokes.
The and Beautiful Strokes . CS5 introduced the Perspective Grid Tool (drawing 1-, 2-, or 3-point perspective in real-time). More importantly, it added variable-width strokes (you could taper a line like a calligraphic pen) and the Bristle Brush (simulating paintbrush textures). It also dramatically improved the anti-aliasing of vector art on-screen. adobe illustrator versions by year