perspective, aerial perspective and linear perspective.
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Show them a flat piece of paper and explain that it has size - high by wide by no volume, turn it sideways to show this. For volume, show them a thick book, size again high by wide by now it has depth = volume.
A line segment has length. That is its only dimension. It does not have any width, or height or depth.
The height in all cases is taken with the dog standing on a level surface, his front feet directly under him, his hind feet in the accepted show stack position for the breed. If a dog is measured officially at a show, a U-shaped wicket is used. Both legs of the wicket are placed flat on the ground, and a moveable bar is adjusted to fit firmly on top of the withers.
With some degree of difficulty, one could fan the deck out in one hand, or split the deck between two hands. One sure way of showing all the cards is to lay them out one by one, side by side on any flat surface such as a table.
In the treble clef, the note of b-flat can be found on the third (or middle) line on the staff. In the bass clef, it can be found on top of the top line, and on the first line.