What better way for kids to understand visual space, than to make their own ruler.
Take a ruler and place it next to a card stock paper strip.
Have kids draw a mark at each inch and then embellish it. (this is great for visual-perceptual and visual motor skills)
PT & OT: May want to have kids make their own ruler strip and see how far down the strip they can jump or step.
ST: May use it to see how far one one kid should stand next to another kid or how tall an item is.
Option: You may substitute card stock paper for regular paper and then laminate it. Make it fun by using stickers, crayons, markers, or spangles.