Tangible v Intangible

Shadow being intangible, and residue being tangible.
What tangible objects or materials can represent this intangible object?
Do these tangible materials represent an intangible matter, such as a shadow?
What is the relationship between tangible and intangible?
Can they work together to form one?
Going back to the concept of a shadow being an inseparable companion.
Can a tangible residue be an inseparable companion?
Can you be tangibly dressed in the residue from an intangible matter?
Can you ‘feel’ dressed in the residue from an intangible matter?
If shadow is the residue of a form and light source, then what is a shadows residue?

What materials leave a residue? And what kind of tangible properties do they have?
Water: Sits on skin, some absorbs, falls down the body/ object along contours in droplets.
Fabric i.e. Cotton: Small fibres left on skin, imprints on body if too tight.
Tomato sauce: Sticks to skin, falls down the body leaving a residue.
Ink (marker): Stains skin directly, leaving a tick line, with even coverage of colour.
Ink (pen): Pulls flesh when trying to move across skin. Leaves a thin line.
Ink (liquid & brush): Thickness depends on brush. Will stain skin, but depending on the amount of liquid may drip down surface.
Paint (watercolour): drips down body, does not stain skin as well as ink.
Paint (gauche): sits on top of skin.