A floating platform was seen among the clouds while walking downtown.

What I saw was not so much a 'flying' object, as it was a floating object.
I usually go for morning walks mid-morning at work, and this day it was quite cloudy.
There was a storm that was coming in and it had not started to rain. As I walked, I looked up at the clouds to determine if it would rain soon. Among the clouds I noticed what looked like a circular platform. There might have been a rail at the top, but I can't say for certain.
There were no sounds and the platform did not seem to move. It appeared to be stationary.
Size of the platform is also indeterminate as I could not tell how far away it was. The platform was not directly overhead, but it was not low on the horizon.
I was talking on the phone when I noticed the platform and it remained in sight for at least a minute or two. I stopped to tie my shoe laces and when I looked up, the platform disappeared. It could be that the platform was lost in the clouds.
I could not make anything out on the platform, other than it was a circular shape, very much like a platform or a stage.