Abstract: An apparatus comprises a covering arrangement suitable for covering a water tank which can be mounted onto an external portion of a building, said covering arrangement being made in the shape of an architectural component, and further comprises an angular positioning device such as to keep said tank in a substantially vertical position; an apparatus comprises a covering arrangement suitable for covering a component of an air-conditioning system which can be mounted onto an external portion of a building, said covering arrangement being made in the shape of an architectural component; a method comprises: reproducing a selected part of a building to get an image therefrom on a layer element; applying said layer element onto a supporting surface surrounding a functional non-architectural element.