It’s an opaque black cube floating in space, an edge is facing me. Like the old NeXT cube symbol really.
Assuming this ladder is meant to be in the same white “space”, I guess it’s against a wall, making the “space” a big empty white room (except for the cube and the ladder). On the left side of the room (from where I stand). Propped up against the wall, as i’s a simple wooden ladder, flat and not the V-shaped fold-out kind.
Flowers? OK… I guess they’re in a vase on a table that has now been called into existence for this vase to be placed upon. They’re yellow flowers, I forget what those kinds of flowers are called. I guess they’re OK.
Feelings they give me? Mostly confusion in that I don’t see why I had to create a table with a vase of yellow flowers in an otherwise blank white room with a floating black cube in the center and a wooden ladder on the wall. I don’t generally think much about flowers one way or the other.
A storm? I guess it’s outside, so hey now there’s a window on the wall. Near to where the ladder is propped. It’s a violent storm as that’s the only kind worth mentioning: lightning, thunder, strong winds. Kapow! Krrrash!
A horse is coming through the storm because there is a rider on him making him go. The horse obviously would rather not be in the storm and is happy to ride at a fast pace towards the house, which is where this window, door, ladder and cube must be. It’s a black horse with white “stockings”, and the rider on it is wearing a black cloak with a collar turned up, and a wide brimmed hat, head tilted against the wind and rain.
Three adjectives for the horse? I don’t know much about horses in real life, mostly I’ve read about them in fantasy novels. So: steaming with sweat, wet with rain, eager for a blanket and feed in a covered stall. Which I hope this strange white house has. Well sure, since I seem to be in a position to extend it with my imagination alone, why not?