The radar tower is something I did a couple weeks ago, the bar stool I did today
Looking good, I remember thinking those radar towers were giant golf balls when I was younger. My 2 cents on the bar stool is that the base looks like it’s too small to hold up not only the chair but the person on it also. If it looks too big with a larger radius then try making it thinner. Keep it up 
LOL when I showed this to my little brother who’s 10 he called it a golf ball tower!
and for the base of the stool… I was looking at a ref image when I did it and that one was like that too, but I’m assuming this type is meant to be attached to the floor.
thanks for the comments!