It's clear glass month at the ASL remote class. Clear glass is made up of lost edges, reflections and refractions. These can be seen clearly on a white background. Refractions are the objects behind the glass which show the shape of the glass. Reflection is what is shown on the glass from a nearby object. The challenging part is color changes that are very subtle. They aren't necessarily value or saturation, but small temperature changes.
Clear Glass Plate and Orange