Auggie's Face
Right at the beginning of the novel, it is established that Auggie has a facial deformity: however, no one describes exactly what Auggie's face looks like until Via begins her section. She goes into great detail about her brother's appearance, with lines like "[His eyes] slant downward at an extreme angle, almost like diagonal slits that someone cut into his face, and the left one is noticeably lower than the right one" (Part II, pg. 88).
Summer
More than once, Auggie takes note of the way Summer looks. When she sits down at his lunch table for the first time, he remarks that "Summer looked like her name. She had a tan, and her eyes were green like a leaf" (Part I, pg. 53).
Jack's Sled
In the section that he narrates, Jack Will describes how he discovers and repairs an old, discarded sled; when he tries the sled out, he is amazed by how fast it is. Jack even makes the sled his own by giving it new decorations and a new name, Lightning: "I painted LIGHTNING in gold letters on the middle piece of wood, and I made a little lightning-bolt symbol above the letters" (Part IV, pg. 147). Such careful descriptions show how proud Jack is of his new possession -- and underscore the contrast between Jack and his wealthier classmates, who see cast-off items such as the sled as little more than junk.
The Fairgrounds
While on his trip to the nature reserve, Auggie goes into detail about the way the fairgrounds look. The sun is setting just before the students begin watching the movie, and Auggie remarks that "It looked like someone had taken sidewalk chalk and smudged the colors across the sky with their fingers" (Part VIII, pg. 259). This is an especially pretty sunset for him because he has spent his entire life in the city: seeing the sun set between buildings is not the same as seeing the evening sun out in nature.