After you draw the door, Kaleb can lean his weight on it and it opens, like breaking a hole in the dimension.

Kaleb, filled with excitement, passed through it as he expressed his gratitude to you.

-Yes! I knew it! I knew it would work! Whoo-hooo! Thank you! Thank you, thank you, thank you! Finally! It was too white for my liking! Pheeew! Now... where are we?