It's closed now, but it was brilliant. Her paintings look great when they're big in a gallery. The slight texture of the paint and canvas adds just enough to make it much more rewarding than looking at pictures.
There's obviously a graphic quality that appeals to graphic designers. She must have influenced hundreds of album covers and logos and tshirts. But in real life they feel more "painterly" and better for it.
Her early sketches and college paintings were lovely. A reminder of everyone's days at art college, except she was obviously better than you and me.
The best bit was her planning sketches, showing the way she works out the geometric patterns. Lots of graph paper. Graph paper! Wonderful stuff from a wonderful, timeless, artist.