Polychrome, laughing at the absurd sight, came dancing up and she, also, came to a sudden stop, but managed to save herself from falling.
Everyone of them was much astonished, and the Scarecrow said with a puzzled look: "I don't see anything." "Nor I," said Woot; "but something hit me, just the same." "Some invisible person struck me a heavy blow," declared the Tin Woodman, struggling to separate himself from the Tin Soldier, whose legs and arms were mixed with his own.
"I'm not sure it was a person," said Polychrome, looking more grave than usual.

"It seems to me that I merely ran into some hard substance which barred my way.

In order to make sure of this, let me try another place." She ran back a way and then with much caution advanced in a different place, but when she reached a position on a line with the others she halted, her arms outstretched before her.
"I can feel something hard--something smooth as glass," she said, "but I'm sure it is not glass." "Let me try," suggested Woot, getting up; but when he tried to go forward, he discovered the same barrier that Polychrome had encountered.
"No," he said, "it isn't glass.

But what is it ?" "Air," replied a small voice beside him.

"Solid air; that's all." They all looked downward and found a sky-blue rabbit had stuck his head out of a burrow in the ground.