;)
This painting is a study in both contrast and opposites. The analogy of dryness/inanimate objects rendered in black & white which is a metaphor for death versus the wet/living objects rendered in color which are metaphors for life. Taking color "almost" totally out of a painting leaves only the grayscale modeling of tones unlike normal vision (rods without cones in the human eye).
The title is taken from the song "Happiness is a Warm Gun" - "She's well acquainted with the touch of a velvet hand like a lizard on a window pane." The doing part meaning "doing" a pushup which is the word for lizard as well as pushup in Spanish, since lizards arm position looks like they are in the middle of doing a pushup.