This question was posed to me at an interview. I know weird right? It kind of caught me off guard, considering most interview questions thrown at me are "What each layer of the Open Systems Interconnection Model?" or "Write a function for the Fibonacci sequence". I had to think hard about this one. Flower, I dont even know that many types of flowers, rose? (too girly), tulip(too weak) dandelion (omg, i think that's a weed right?), what else? I only know three types of flowers?! Think, think, then I blurted out cactus (shoot, that isn't even a flower!) Plant...flower... I wasn't applying for a botanist position. And why cactus? Because they are strong, can survive anywhere with little maintenance, and will form roots in the roughest of conditions. Good answer right? I didn't get the job.
I do have an affinity towards cactus, perhaps because its because my mother always loved to plant succulents. Or it could be because they are one of the only plants that survive my brown thumb. Below are some pictures of a sort of terrarium. Although not the true definition of a terrarium, it has the same encased beauty. Tutorials seen in many blogs such as this one.