Are the particles of a colloid "solid"? I want to understand what are the particles of a colloid in the microscopic scale. According to Wikipedia:

A colloid is a phase separated mixture in which one substance of
microscopically dispersed insoluble or soluble particles is suspended
throughout another substance.

What I can't understand is how we can have a phase seperation when we have soluble particles? I looked for some pictures and I got more frustated. For example in the following picture Colloids: 
the particles seem to be like ordinary atoms/molecules just scaled up. So how can this particles exhibit bulk properties and classified as &quot;solid&quot; particles? Is the picture a simplification? I mean should colloid particles be represented as clusters forming a phase (e.g. solid) that is invisible to human eye?
Colloidal solutions may contain particles made of liquids or of solids. The particles are liquid in substances like mayonnaise or moisturizer, whose particles are droplets of oil (in water) for mayonnaise or droplets of water (in oil) for moisturizer. They can be solid in substances like acrylic paints, where the particles are made of semi-solid paint dispersed in water. The great advantage is that these paints can be diluted with water. Fresh spots are easily removed. Colloidal gold does exist. The colloidal particles can even be gas in whipped cream, froth and foams.