Point- a definite location in space that has no depth, length, width or height.
The right image shows that points can be literal and implied at the same time. The recessed lights are points in themselves. The corners where the walls meet can also be considered points. These walls have to meet somewhere right?
Image from the londonglass.co.uk
Here, we can see that lines are everywhere! The table, area rug, artwork, and curtains are all made up of lines. Let's not forget about where the walls and ceiling meet. Those are lines as well. Even the lamp shade can be read as a line.
Image from Eileen Johnston Interiors
Plane- a two-dimensional shape composed of a series of lines with no depth.
Recessed ceilings, walls, and even the floor all considered planes. Do not be confused; a plane is literally the surface of a form or mass. Remember, planes have no depth!
Image from www.3dreid.com
Volume- a three-dimensional form composed of points, lines, and planes and has mass.
Volume is also know as form. Forms in this picture are the pillows, stairs, platform, and structure. Volume is literally the culmination of point, line, and plane working together.
Image from tashen.com
