Sometimes a person has an object they are holding or using, which is smaller than they would prefer.
e.g. half a croissant, instead of a whole croissant.
A coffee table instead of a dining table.
A trumpet instead of a euphonium.
A half-pint glass instead of a pint glass.
In each of these
cases, there are ergonomic issues to do with the interaction between human, object, and (where appropriate) support substrate (e.g. floor or ground).
Proposed is a lightweight space-frame construction which mates with the object and extends its effective size and volume to that of the larger desired equivalent.
For example, with the half-croissant, the space-frame will be in the shape of the other half of the pastry, and will have appropriate mounting points for affixing to the half-croissant. Now the composite object can be displayed, handled, and stacked as if it were a full croissant. In use, the user can hold onto the space-frame and bite into the half-croissant.
(N.B. it is important that the space-frame element of the composite object is used only for ergonomic purposes not for funtional purposes, i.e. don't hold the half-croissant and bite into the space-frame).
Any other spatially-deficient object might be similarly extended in the same way.