Objects in the image:
category: person
category: skateboard
category: skateboard
category: backpack
category: person
category: person
category: person
category: person
category: person
category: person
category: person
category: person
category: person
category: person
category: person
category: person

Guessing-game dialogue about one of the objects:
q: is it alive?
a: No
q: is it green?
a: No
q: does it use electricity?
a: No
q: is it a rail?
a: No
q: Is it multi-colored?
a: No
q: is someone standing on it?
a: Yes