Besides ease of growing, time of flowering, high resistance to disease and vagaries of weather, enormous range of colours, value for money, variety of shape and habit, fascinating history, new launches every season, simplicity, stylishness, gorgeousness, beauty, and general fabulousness, I also like tulips because they change as they grow. This is one of the best reasons for growing them to pick and bring indoors.
Because once you have a vase full of tulips or even just a single stem in a milk bottle, you have the pleasure of watching the changes that occur as the flowers continue to grow in height, as the petals enlarge, spread out, change colour, go darker, go paler, develop stripes and featherings and shadings, and open to reveal amazing interior patterns and splodges and bases. Even in their dying throes, tulips are flamboyant and extravagant, throwing back their petals, stretching out, and revealing all.
In a short space of time they go through almost as many changes as David Bowie has in his career.