Material set and method of installing the same

A method of installing a design material set that covers a target surface,

• wherein the design material set comprises:
• an attachment;
• and
• a cover to be attached to the attachment,
• the attachment and the cover have a base and a side wall surrounding the base,
• the cover is capable of being attached to the attachment by fitting the side wall of the cover to the side wall of the attachment,
• a shape of a part of the attachment facing the cover in plan view is a one-fold shape, which is inscribed in a minimum standard rectangle, or an integer-fold shape, which is inscribed in sides of a shape formed by an integer number of the minimum standard rectangles arranged side by side,
• provided that an attachment of the one-fold shape is referred to as a one-fold attachment, and an attachment of the integer-fold shape is referred to as an integer-fold attachment,
• the design material set includes a plurality of covers, the covers including a one-fold cover, which has a size that allows the cover to be attached to the one-fold attachment, or an integer-fold cover, which has a size that allows the cover to be attached to the integer-fold attachment, and including at least integer-fold covers of different integer-fold numbers,
• a plurality of attachments is arranged lengthwise and widthwise side by side on the target surface,
• a design pattern formed by a plurality of covers is configured by attaching the one-fold cover to the one-fold attachment, attaching the integer-fold cover to an integer number of one-fold attachments, the integer number being equal to or greater than 2, or attaching the integer-fold cover to the integer-fold attachment,
• the design pattern can be changed by removing a cover from the attachment and attaching a new cover, or rearranging the covers,
• the design pattern can be changed by replacing the integer-fold cover attached to the attachment with an integer-fold cover of a different integer-fold number, and
• the design pattern can be changed by changing the orientation of the integer-fold cover attached to the attachment to a lengthwise orientation or a widthwise orientation,
• wherein attachment of the one-fold cover to the one-fold attachment is attained by friction between the one-fold cover and the one-fold attachment, and attachment of the integer-fold cover to the integer-fold attachment is attained by friction between the integer-fold cover and the integer-fold attachment, and
• wherein a hollow space is formed inside the one-fold cover when the one-fold cover is attached to the one-fold attachment, and a hollow space is formed inside the integer-fold cover when the integer-fold cover is attached to the integer-fold attachment.