Dot by Patricia Intriago is an opposites book that uses pairs of dots to illustrate concepts. Like many other reviewers, the cover art made think of Press Here by Hervé Tullet (review coming) but Dot ended up having much more re-readability.
Many of the dots are black circles against the start white background. Sometimes the dot isn't a dot or it's distorted. For example, in the "hard dot, soft dot" spread, a finger presses down on the dots. One dot remains circular while the other one appears to give under the pressure. When color is needed, it's used but sparingly.
Early on, red and green are used for "stop dot, go dot." The simplicity of the book reminds me of the earliest pages of One Fish, Two Fish, Red Fish, Blue Fish by Dr. Seuss. It had a similar appeal as Seuss's fish book for my daughter. Before returning it to the library she read it at least a dozen times.