This is a tough question...!
I think whereas a SET places you somewhere to set the scene, a prop is something that relates to a character or an action; someone or something interacts with it; it can have many meanings and it must add to the character or scene.
A prop can be...
Manipulating the prop vs being manipulated by the prop
Why is the prop there?
Is it necessary?
What does it mean?
How do performers react to a room full of props and time to play?
1. How did you feel?
Interesting because I make children do this all of the time but I find it really difficult. Much harder when I over think and I find it challenging to do something other than what the prop is or using it to influence a character.
2. Favorite Prop
Paper or bag for inspiring movement
Slinky or baton as body extension
Mop, hat or glasses to make another character
3. Task easiest to develop
I have no idea! They are all hard...but I found it hardest to be manipulated by a prop.
4. Prop vs costume - can you consider a prop as something you wear?
YES! Costume can become a prop in the same way a set can. But a prop is different in that the performer needs to rehearse with it but they don't need to rehearse with costume or set - maybe??
I have really enjoyed working with PAPER as a prop. I find the changing qualities very inspirational for movement especially when crumpling it up and then allowing it to release, burning it and ripping it.
My 'Ove' solo initially had no prop, then I added paper in later and it made huge changes to my movement and the story that went with the movement. For my group piece I am looking to include paper again and continue exploring how my movement can be inspired and altered, and how I can be manipulated by using this very versatile prop.